Invited by vegetarians for dinner? Point out that since you'd no doubt
be made aware of their special dietary requirements, tell them about
yours, and ask for a nice steak.
I was invited, and they turned out to be cannibals, living under a vegetarian cover. The scoundrels! I barely escaped. Whew. ;')
My best friends invited me many times during their vegetarian years (they decided to quit meat-eating early in their marriage) and the food was generally pretty good. I don't eat meat at every meal anyway. :')