I used to run a mediaeval/renaissance group and we used to do banquets in costume. Banquets were always a frighening area - organisers were often unclear as to what they wanted - a folk night style entertainment or a period music exeperience.
For example, one banquet we did was for a local village fete - they wanted us dancing on tables and performing stuff that people could join in with (yes, we wheeled greensleeves out). It was a terrific night.
The following week we played for a banquet which had been nearly three years in the planning (all the crockery and and cutlery was made especially for the event and all the food was authentic and prepared as it would have been at the time - the vegetables were grown for the event). For this one we were told what period of music we had to play and had a meeting with the organisers beforehand to make sure that we conformed to their standards of authenticity.
A classical singer of renaissance music with one of my groups was booked for an event not far from Manchester. As he prepared to sing some Dowland with his lutenist the compere stood up and, to the bellowing drunken mob, introduced him as "a singer of dirty songs!"
I suppose the lesson is to make sure what you are going to and what is expected of you!