Here Comes the Fun Cooker! This March, Trivia Mafia heads to 30 Rockefeller Plaza to test your knowledge of “30 Rock”—facts as "useless as the Winter Olympics." Expect questions about Liz Lemon’s hilariously disastrous love life—from Dennis Duffy to Criss Chros—Jack Donaghy’s intense rivalry with NBC’s top brass, and unforgettable cameos from Jon Hamm to Oprah.…