How to 'pretend' drink with a colleague?!

Blanche • 35 year old with Rheum Arthritis..trying since Sept 2015.. 2 miscarriages *UPDATE! PREGO with our 🌈👶🏼 * Due Jan 2017
Help! I just tested + and have a work convention next week in Vegas!! It's too early to tell work so I need to figure something out.. I'm not worried about bars (I'll just go order my own) but we usually go to a restaurant and sit down at the table together/order from a waitress. How on earth will I figure this one out, I'll only be about 5 weeks :(