Look I know this Forum is a little old and Im very new to all this but why wouldnt you all go to Max Brenner Chocolate Bar - Melbourne Central for a Melbourne fashionisers social event?
Their hot chocolates and coffee are fantastic also waffles with ice cream and strawberries, Yummy!!
You could go there in the late afternoon and then if everyones still keen to keep things going (and if the peeps are over 18 years old) you hit up Madame Brussels Level 3, 59-63 Bourke St for some cocktails with its very funky setting that has fake Grass floors and waiters in all white 70s tennis outfits serving you your cocktails.
A mix of great food, Fun Drinks and both very social.