How can i make AMAZING Relounge of a Fashion Store?

How about a samba drum and dance band? Samba schools are all over, they have incredible energy and would be unexpected. They are often looking for places to perform, and have programs ready to go.

Have a stupendous bash with a mystery “play” Who Killed the Designer/Model? and a cast of characters dressed perfectly in your clothes dropping clues as they mingle at the bar, the buffet table, on the dance floor, dressing room—with a sound and lighting team to enhance their visibility [small mikes and spotlight setups] and have a murder victim also draped in your clothes and on and on. The more players, the more clothes modeled. Get someone to write a really good script. The solution shouldn’t be too easy.

Give clues, and give designer prizes to those who guess the killer [don’t make it too easy]
And have all the players appear in your clothing for final bows.