Hi, disposable plastic decorating sheets work for me
Most of the mess is either on you guys or spread over the sheets. They'll fit into a heavy duty bin bag no problem (assuming your not going for it with gallons of goo lol!). They can rip but again some kitchen towel and well placed masking tape attached to lighter sheets works wonders. Then you can relax, have fun and look forward to the shower! Only problem is what to do with the bin bag, but one of you has to just go for it to the car boot. Could be done more discreetly by putting the bin bag in a large holdall.
Hope you have (or already have had) fun!
Mike