Diane Lewis drops into Ron Swanson's office at the Parks Department accompanied by her daughters Ivy and Zoey, who loudly run and scream around his office. Ron states he and Diane have been seeing each other for a while, and he appreciates how she is a strong woman, but her children are loud. Andy playfully runs into the office and starts chasing the girls around, knocking things over. Diane invites Ron to go trick or tricking, which he isn't interested in, but Andy begs him to go and Ron agrees.
Leslie Knope, with the help of Ann Perkins, is looking at a beautiful three bedroom, two bath house along with her realtor, Martha. Leslie asks if there's a trampoline room, to which Martha tells her there are no houses in the world that have one of those. Leslie tells the camera that Ben is coming back from D.C. in 10 days and that they're moving in together. They would move into her place, she says, but "it's a scary nightmare hoarder nest". Leslie notes these are Ben's, and Ann's, words. And the official form filed by the Health Department.
Leslie is thrilled to begin her life with Ben, but Martha isn't as enthused about Leslie's agreeing to lease the house. To help her, Ann blasts the song "Party Rock Anthem" from her phone and the two dance along to it.
Chris announces he's an aspiring life coach and shows off his certificate for "most improve patient" of Dr. Richard Nyguard, who he sees five times per week. He explains he only got it after asked for it while crying loudly, but it makes him feel better. He also announces the City Managers Office will celebrate Halloween this year with a movie night at City Hall in the courtyard, where everyone dresses up in costumes and watches the 1986 horror camp classic called Death Canoe 4: Murder At Blood Lake.
Ben, alongside Jennifer Barkley is celebrating Congressman Murray's sure victory. He tells April she can head back to Pawnee early. Jennifer offers Ben a promising job in Florida, forcing him to rethink he and Leslie's relationship.
Ron, dressed as a pirate, and Andy, dressed as a policeman, are with Diane, Ivy, and Zoey, and are trick-or-treating. Andy is working on his observation skills because he's applying to the police academy soon. After getting an emergency phone call about kids pooping on the middle school soccer field, Ron and Andy agree to stay with the girls so they can continue celebrating Halloween.
Back at City Hall, they're busy watching the Death Canoe 4. Ann is dressed as Olympic gymnast Gabby Douglas, Leslie is dressed as Rosie the Riveter, and Chris dresses up as as his biggest fear: an older version of himself. Jerry wears no costume, just his usual slacks and sweater vest. Donna decides to live-tweet the movie and also tweets the previous sequels. It is seen to be a horrible movie, but she appears to love it.
Leslie and Ben are on the phone, and Ben is explaining about the job offer he received from Jennifer, which involves a businessman who wants to run for governor in Florida. Worried, Leslie reminds Ben she just applied for a lease and asks if he's going to take the job.
Meanwhile, Ron and Andy are still with Ivy and Zoey trick-or-treating. Ivy runs up to Ron, complaining that Zoey broke her tiara. In an attempt to remedy the situation, Ron breaks Zoey's tiara, which then just causes both girls to be upset.
Leslie and Ann decide to scare Tom when he comes out of the bathroom to cheer Leslie up because of the news about Ben's job offer. Instead, Jerry Gergich walks out, farts, and then collapses to the floor, continuing to fart loudly. Ann realizes that he's suffering from a heart attack and Leslie calls 9-1-1. Tom walks out of the bathroom, and starts complaining and making jokes about Jerry's farting. Leslie yells that Jerry's having a heart attack, and Tom immediately starts asking Jerry if he's okay.
Jerry is now in a hospital bed, and Ann tells Leslie that Jerry should be out in a day or two. Tom continually tries to get Dr. Harris to say that Jerry had a fart attack. Jerry says the mild heart attack was a wake-up call, because he wants to have at least another 30 years with Gayle.
Because their health care plan isn't that good, Leslie decides to arrange for the Parks Department to throw a garage sale fundraiser to help raise money for Jerry's medical bills. Donna is shown attempting to sell jewelry and the only item Ron has for sale is a table he made for $500, at which he is quietly reading a book. Tom is selling some of his designer clothes.
Ron explains to April that things aren't going well with Diane, because she wasn't happy with the way he handled trick-or-treating with Ivy and Zoey, leaving him a loud voicemail. He's unsure if he's ready to handle having a whole family, explaining that his house is full of alarms and tripwires.
Ann decides to auction off stuff that represents her different phases in life when she was dating certain men. She has boxes of things for Chris, Tom, Andy, and an unknown man named Rob, but not Mark, showing he didn't have much of an effect on her life.
Ben and Jennifer are shown on a yacht with a man named Howard Kurtzwilder, who wants to run for governor of Florida, but has little chance of winning due to barely any name recognition. Ben argues that the Barkley Group will help lead him to victory.
Donna ends up getting in a bit of trouble with some Pawnee residents because of her tweets about the movie screening. They are angry because she tweeted the spoilers and also didn't tag them NSFW. Tom is having a hard time selling his clothes, especially because of his tactics. He tries to sell a jacket for more than he paid for it, because he had a scorpion embroidered on it.
Diane shows up to talk to Ron, explaining she was stressed and apologizes for reacting the way she did. She asks him if there's anything he would like to say, and he tells her she looks nice today. She stares at him, angry, and then tells him that he broke her daughter's tiara and ruined her Halloween. She can't believe he doesn't feel bad about it, and tells him goodbye. April tells him he's blowing it. Ron pretends to not care, but April and Andy realize he is sad. However, Andy thinks he's sad because Ron didn't sell his table.
Ben calls Leslie in the middle of the auction to tell her about the job offer, explaining that accepting it would probably mean putting moving in together on hold. Upset over the news about Ben's job offer, Leslie decides to do something to make herself happy, and tries to raise more money for Jerry by (without Ann's permission) trying to auction off a date with her. At first, a very attractive guy is bidding and Ann decides it isn't such a bad idea. Then, a man in a tank top with tattoos bids $900 on her, causing the attractive man to drop out of the auction. The tattooed man's date night plans included taking her out to watch him do belly flops in the mud pit, then getting Thai food and a tank of Nitrous and "seeing what happens". Ann bids on herself and quickly runs off the stage, refusing to go on the date.
Meanwhile, Tom is approaching a potential customer at the auction: a teenage boy trying on a jacket who is with his mom for Homecoming. The mom refuses to buy the jacket when Tom tells her it's $300, because her son grows out of clothes so fast, but agrees to rent it for $20 per week. Tom comes up with his new business idea of Rent-A-Swag, where he rents his designer clothes out to teenage boys.
Leslie visits Jerry in the hospital, informing him they only raised $1200 for his medical bills. She's upset about Ben and her's future, and that their plans aren't going to work out. Jerry advises Leslie that we can't plan our futures. Back in Washington, Jennifer notes that she's never seen anyone as sad as Ben is over good news. He tries to explain about his girlfriend, and his apprehension over accepting the job, but she interrupts him.
Ron brings Diane flowers, chocolates, and grout cleaner. She explains her kids are nonnegotiable and that "it's a package deal". He apologizes, saying he's been alone most of his life by choice, and kids are new to him, but he'd like the chance to prove himself. He also brought the girls a saw to teach them how, but realized later it was dangerous.
At the end of the episode, Leslie is telling Martha she's not going to be able to lease her dream house. Martha, as indifferent as ever, reminds Leslie she can't get her deposit back. Just as Leslie is asking her if there's any way she could put down some money, Ben walks into the room with his hands behind his back and gets down on one knee. In the middle of popping the question, Leslie tells him to wait, explaining she wants to take in the moment. He then goes to ask her again, but she doesn't let him finish, telling him yes. He finishes asking her to marry him, and she replies with "oh, yeah".
We see at the end of the episode that Ron and Diane have taken Ivy and Zoey out trick-or-treating, even though it's now November 8th. Ron is seen slipping the man some money after he brings the girls back calcium chews and roll of cookie dough instead of candy.
A gallery of episode photos can be found here.
Diane: Hey, am I interrupting something important?
Ron: Impossible. I work for the government.
Chris: It's just a piece of paper, and he only made for me after I specifically asked for it while crying loudly... it sure meant a lot to receive.
Donna: Hope no one minds if I live tweet this bitch!
Andy: I'm applying to the Police Academy soon, and the manual says I have to work on my observation skills, so: Tree. Leaves. Night. Sky. Hand. Andy's hand. [Farting noise] What else you've got?
Donna: Read my Twitter feed. I livetweeted the first three this morning in preparation. In the fifth one, the canoe is actually the hero -- it's a crazy twist!
Leslie: Florida? They have sharks in Florida. And swamps. And swamp sharks.
Andy: [talking into tape recorder] 7:34 p.m. Man dressed as a nerd. Female dressed as...crazy witch.
Man: Neither of us is in costume.
Andy: Case closed. Candy please.
Tom: Seriously, did you eat farts for lunch?
Tom: I just want to hear the doctor say that Jerry had a 'fart attack.' Is that too much to ask?
Leslie: The Pawnee Municipal Employee Healthcare Plan is kind of crappy. One time I sprained my wrist, and our insurance claimed that having a wrist was a preexisting condition.
April: [On how much Andy should sell an old hat for] I don't know, eight cents. [Upon hearing Andy wore it the first time he heard Pearl Jam's Vitalogy] Oh, $900.
Ron: I like Diane, but I'm not sure if I'm ready for a whole family. If the kids ever wanted to come to my place, I'd have to take a whole week off work just to undo the alarms and trip wires.
Ann: Recently, Leslie pointed out that sometimes when I date someone, I kind of adopt that person's personality. The evidence is fairly damning: Chris Traeger, exercise phase; Andy Dwyer, my grunge phase; Tom Haverford, my needless shopping phase... also my credit card debt phase -- [Holds up robe with AP monogrammed initials] Ann Perkins.
Donna: If you don't like what I'm tweeting, then don't follow me.
Morris: What are you doing?
Donna: I'm live tweeting this dumbass conversation.
Leslie: 3 out of 4 married couples have met each other at spontaneous auctions!
Ann: I don't think that's true.
Leslie: I'm sorry, Jerry, but your future has been cancelled. We only raised $1200.
Jerry: Leslie, thank you! That is amazing.
Leslie: No, it stinks. It's not even close to what you need, with all your bills and the inevitable follow-up problems and a lifetime of chronic misery that awaits you. I mean, you had this whole plan for your retirement, and your beach house, and now [sighs]...your future is just a huge pile of crap.
Jerry: Leslie, you can't actually plan your future. I mean, there's no guarantees in this world. As long as the people that I love are apart of my life, I will be just fine. Hey, want to stick around? Watch some of my stories with me? Tonight's Strawberry Jell-O Night!
Leslie: Oh, my God, your life is so depressing. No thank you.
Leslie: Oh my God. What are you doing?
Ben: Thinking about my future. I am deeply ridiculously in love with you. And above everything else, I just want to be with you forever. So Leslie Knope, will you--
Leslie: Wait, wait, okay? Just--I need to remember this. Give me a second.
Leslie: No, no, no, no, hold on. Just--I need another second, please. I need to remember every little thing about how perfect my life is, right now, at this exact moment.
Ben: [laughing] Are you good?
Leslie: Yeah, I'm good.
Ben: Leslie Knope, will you---
Ben: Marry me?
Leslie: Oh yeah, yeah!