S.,
I read everyone's replys, and they were all good, except for Anthony T., who suggested you treat 10-15 people to a Walt Disney World Vacation! LOL!! And while you're at it, why don't you call Donald Trump and ask him if you can rent his private jet to fly all of your husband's friends to Orlando for the weekend? Too funny!
Anyway, I like what a couple moms suggested - that you do whatever your husband loves. If it were my party, for example, I would want my husband to have my close friends over at our house, order in Mexican food, and have a game night. I love playging games like Taboo and Scattegories. That would be my kind of night. So figure out what your husband would love to do, and try to make that happen. You said you don't want it at your house, so maybe you can rent out a private room (if not too expensive) at a place like Boca de Bepo (b/c their dishes are enormous, and meant for a few people to share). If you do have a private room, you can ask your husband's friends to tell a funny story about him, and you can go around the table and have everyone say something. I have always wanted to hire a fortune teller for an evening. That would be nice if you are in a private room, to have a fortune teller come and read everyone's fortunes (again, if it's in your budget - but would definately be much, much, much cheaper than taking everyone to Disney)!
Good luck and have fun!