I sing most of the night. There is a different approach to the cocktail hour, dinner hour and dance sets, and there is room for vocals in all three areas.
You need to adapt to a "smooth", EZ style so you don't demand too much attention during quiet times. Intrumentals are nice too, but as a singer .... I feel like I'm holding back when I only play instrumentals. I do one or two, at most per set. Sometimes I only do 2 or 3 all night.

I sing, therefore I am.