Inexpensive Menu Ideas for Large Rehearsal Dinner

Get sliced deli meats, cheeses, and rolls. You can arrange them on dollar store trays, along with lettuce leaves, tomatoes, bowls of pickles, mayo, mustard, etc. Have someone make nice potato and macaroni salads, etc. If you want guests rather than immediate family and attendants, have them bring pot-luck dishes, bottles of pop, etc. Congratulations and good luck.

As it's not a rehearsal dinner, but a dinner in general after the rehearsal, I would have the worlds largest salad bar! It's summer, no one wants anything hot or that might be messy to eat. You can rent inflatable salad bars that hold ice, and bring your own additions such as bowls, tubs, etc.

I saw this once in a wedding in Tucson, which was outdoors and it was a stunning success. Cold, crisp and easy to eat, everyone loved it.

http://www.amazon.com/Unknown-Inflatable-Salad-Bar/dp/B0017VKR7M
As a diabetic, and with people who have gluten problems, this might be the best "all around please everyone" thing.
I hope this helps.

The rehearsal dinners that I have heard of are strictly for close family members and participants in the wedding. No dates allowed. You could serve sloppy joes, and various salads. Or else make it pot luck with the closest family members bring dishes to pass.