I'd have 2 dinners, because I'd want one with the wise super-cool alums, and then one with the youngins so we can cause trouble.
Dinner 1: Sistermadly (because she is funny and wacky), AlphaSigOU (because we could talk about space stuff), and Maharet (so she could show me her blinged out badges!)
Dinner 2: GeekyPenguin, SATX, and MTSUGURL. But we'd have to make sure that SATX and I go Triad on GP's ass.