Advertising at a car boot

So basically a local car boot organiser has said I can go along and have a space to advertise and get talking to people about my mobile nail business. I will be taking business card, prices lists etc, and the organiser said I should take my equipment if possible and maybe offer small treatments on site.

I was just looking for ideas of what else I could do? What treatments? Would I charge for these or just do say a free quick reshape to get talking to them? Also on the insurance side of...

Advertising at a car boot