You can’t beat a good ceilidh dance for a wedding! But other posters are right – you need a good caller. In that case, you don’t need anyone on the floor to have any previous experience. I’ve been to international student ceilidhs where 98% of the dancers were from outside the UK, with English as their 2nd, 3rd or 4th language, and they had a magnificently good time. There was occasionally a certain amount of chaos, but that doesn’t matter a bit – everyone enjoyed themselves.
Make sure you get a proper ceilidh band, rather than a wedding band that does a bit of ceilidh. The difference in quality is striking. Jingbang ceilidh band and Danse McCabre are both excellent with great callers, and they’ll demo the couples dances, and get down on the floor amongst the guests to help out where needed, but probably a little too far from you, as they’re Aberdeen based.
Have a great time, whatever you do!