Rodney To

Claire has overdone it in Halloweens past and the neighbors definitely don't share her enthusiasm, so this year she's being forced to tone it down and keep it "kid-friendly," and Phil has an idea to hold an open house on Halloween night. Meanwhile, Mitch and Cam host a costume party while contending with Lily wondering who her real mom is, and Gloria's pregnancy hormones are on overdrive, making her even more hotheaded than usual.

Jess panics when her sister, Abby, decides to stay in Los Angeles and sets her eyes on one of the loftmates. Meanwhile, Winston procrastinates about checking his test results for the LAPD entrance exam.

Leslie (Amy Poehler) tries to calm a minor scandal that gets blown out of proportion. Tom (Aziz Ansari) tries to impress a new love interest (guest star Tatiana Maslany), while Ben (Adam Scott) convinces Ron (Nick Offerman) to prepare his last will and testament.

Donna and Joe tie the knot, while April attempts to keep the wedding running smoothly. Ron creates an awkward situation between Tom and Lucy. Jen Barkley (Special Guest Kathryn Hahn) arrives at Ben and Leslie’s house with an interesting opportunity.

Before bidding Pawnee farewell, the gang must complete one last task together: repairing a broken swingset on a playground.