I would think u just cater to the people who are dancing or taking up the dance floor. which in your case we hope are the young’ns lol
But if its the older crowd (and chances are it will be cuz of the booz haha) well then just play their music. u could probably get away with just straight cutting or the easiest mixes available. thats what the dj at the last wedding I went to did and I didn’t see anything wrong with it.
Stepping down n passing up a potentialy good gig jus cuz it might be a bit tough does not seem like an option for me. if anything it will be a learning experience and a paycheck.
jus make sure ur prepared for anything IMO