8:30 p.m., NBC
Parks and Recreation
April (Aubrey Plaza) fills Ron's (Nick Offerman) schedule with meetings, forcing him to actually do his job.9 p.m., CBS
CSI
The team investigates the death of a stand-up comic who is found dead before a reunion tour with his old partner. Comedy legend Tim Conway and poker champ Jennifer Tilly guest-star.9 p.m., FOX
Fringe
In one of Walter's (John Noble) many drug-induced hallucinations, he tells a fairy-tale story to Olivia's niece, complete with film noir themes and musical performances from Olivia (Anna Torv) and Broyles (Lance Reddick).9:30 p.m., NBC
30 Rock
Grizz (Grizz Chapman) announces his engagement, so Tracy (Tracy Morgan) and Dot Com (Kevin Brown) argue over who should be best man. Plus, Jenna (Jane Krakowski) starts dating a new man (guest star Will Forte).11:35 p.m., CBS
Late Show with David Letterman
Dave welcomes the cast of the Broadway musical "American Idiot" to perform a number from the play.
Also on the airwaves...
FlashForward, 8 p.m., ABC
Survivor, 8 p.m., CBS
Bones, 8 p.m., FOX
Community, 8 p.m., NBC
The Vampire Diaries, 8 p.m., CW
Grey's Anatomy, 9 p.m., ABC
The Office, 9 p.m., NBC
Supernatural, 9 p.m., CW
Private Practice, 10 p.m., ABC
The Mentalist, 10 p.m., CBS
The Marriage Ref, 10 p.m., NBC
The Real Housewives of New York City, 10 p.m., BRAVO
MLB Baseball: Diamondbacks v. Cubs
What are you watching tonight?
Follow TV.com writer Stefanie Lee on Twitter: @StefAtTVDotCom
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