Reports on Manzke here have seemed to me too hit-and-miss for the price.
Personally I wouldn’t do that sort of Thomas Keller / Michelin-style many-tiny-courses tasting menu for a celebration. It’s too much about the food and less about the party, an experience like that I’d rather do solo or with one other hardcore foodie who’s as into it as I am.
Majordomo, Osteria Mozza, Chi Spacca, and Bestia are places where I’ve had great meals with a group of friends. Gjelina and Girl & the Goat (where I’ve only eaten solo) seem like good bets as well.