In my rather dull day job I have an event company as a client. They hire lots of dance floors, stages and lighting for weddings directly to the wedding party. Is it not worth talking to the venue to see if you can offload the responsibility of the lighting - get the clients to pay for it from someone else? Or, offer lights as a seperate hire, then sub-hire them? These guys are fairly high end but just thought I'd add this to the mix.