Sounds like a challenge, but I'm sure you're up for it! I'm glad you can control the drinking (walk around with a club soda and lemon slice and no one will be the wiser), but the eating will require you making very informed choices.
Any way of finding out in advance what the catered meals are? I would assume protein and veggies would make up part of the meal? All you have to do is ask for removal of any "starchy stuff" or sauces and you should be okay??
Can you find out what restaurants on the Strip you will be visiting? Or better yet do a search on vegas restaurants, get names, websites and if possible check out the menus. Most places will have chicken, fish or steak...veggies on the side and you're whistling!!!
If you don't have computer access you may wish to bring a small paperback carbohydrate counter booklet with you...and maybe check on some things before you go out to familiarize yourself with lower carb foods and veggies (I once ate one of those mini corn on the cobs at a restaurant figuring this tiny thing could barely have any carbs and later found out that it alone had about 5 carbs!!!).
I think you can do it! Stay focused and determined!
Froufy