Hi! The question is a little off topic, but maybe someone knows where I can buy lighting equipment for festivals?
Question is too vague. If you google "lighting equipment for festivals" you'll get a bunch of hits for big commercial venu kinds of things. Is that what you are after? Or something lower key? Backyard event? Church gathering?
Anyway, the question does not seem Arduino related.
Post your code and perhaps we can help 
Maybe a "little" off topic??