– September 30, 2011 – NBC builds two nights of Halloween-themed programming as the final season debut of “Chuck” (Fridays, 8-9 p.m. ET) and the series premiere of new drama “Grimm” (Fridays, 9-10 p.m. ET) will begin on Friday, October 28. Likewise, Halloween-themed episodes of NBC’s Thursday-night comedies – “Community,” “Parks and Recreation,” “The Office” and “Whitney” -- will be telecast October 27 in recognition of the holiday.

http://tvbythenumbers.zap2it.com/2011/09/30/chuck-grimm-community-parks-rec-office-whitney-go-halloween-themed-on-october-27-28/105615/