first: backup your Virus. so if you do something wrong you can get back.
second: erase a RAM bank, or use an empty one if you have.
third: save your patches one after the other in that bank (like RAM-A0, RAM-A1 and so on). now you only have to go up a step everytime you wish to change patch.
if you like, you can try to go with multi mode: save 16 presets on a patch, then switch between channels
good luck with the show, my TI was great on stage!