I'm doing a buffet lunch for about 15-18 people, including some young children. It's a family gathering between Christmas and New Year. After doing lots of cooking for Christmas itself I don't want anything too hard, so probably mainly cold items with a few snacky type things that can be thrown in the oven.
But... I'm lost for inspiration on what will be interesting but won't break the bank. What are your 'must have' items for a buffet? What do you hate?