Lots of good advice here - just one thing from me:

Watch and adapt. Every wedding is different. Our band does mainly weddings and similar functions where the dance expectation is - mainly - unpredictable. If you get a good crowd up and they're up for it, then you can be a bit adventurous. If it's really a non-dance crowd, then keep it straightforward and have lots of listening tunes to play. Good listening tunes can give people the urge to get up and dance when the opportunity next arises. Gauge the response - see how adept the people are to grasp a dance.

Play it by ear, stay laid back and good-humoured.