Dumb question but have no idea,
how many dances does a mehndi usually consist off? And what what do you do if your from all over the world, and a lot of friends might not be able to make it, very few cousins, who dances then? 
Re: Dances
Depends on your family. Some have none...some go all out and dedicate whole evening to them.
Dances
Its not about quantity.. Its quality. Just enjoy and make most of what and who you have taking part in your day!