At our outdoor summer wedding we are providing two simple mixed alcoholic drinks, two beers, self-serve sangria and fresh lemonade. There will be soda also. We are having the reception at my grandparents country home and building a bar area, as well as a small patio seating area (8 or so seats total) We would like to hire two local bartenders to be responsible for mixing and serving drinks, refilling the water, lemonade, sangria and keeping the area tidy. We expect about 120 guests. The bar would ideally be open from 6pm until 11pm My question is, how should we pay them? Hourly or just a set rate? We will tip them, obviously. I am pretty clueless when it comes to this. Thanks in advance!