I'm reviewing the catering side of this from a wedding guest point of view.
I just want to give them a kudos for their willingness to work with the #glutenfree community. I called ahead and the person who answered the phone assured me that I would just have to ask someone on staff to make me my own meal.
I went to the buffet and got the salad and the julienned vegetables (as they assured me they'd only be cooked in butter). I didn't see anything that looked even remotely safe, so I asked a member of the staff to see if I could get a sauce-free salmon. 10 minutes later I got a GIANT amazing tasting piece of salmon. Seriously - what a treat to find great staff who is willing to work with special guests with allergies.
Please just let the staff know about allergies and they are accommodating. Great salmon. Awesome veggies. Excellent accommodating staff.