Unwelcome requests can be dealt with by agreeing before or early in the performance to do the request later, without any quibble. The requestee, especially at weddings, will go happily go off and get very very drunk. Later in the evening they will more than likely ask again and you again happily agree to perform it later.

With luck you can get through the whole set as planned without upsetting anyone (or playing the request) and it is more than likely that the even more happy requestee will come up to you at the end, to give you a big cuddle and thank you for playing their request.

There is more than one way to avoid plucking a 'turkey'.