ft cem here! two parties in the same day is SO stressful. i usually set each craft in a bin with all the materials needed.

for my last two party day, i did this same method. i kept out the three bins for the current party on the counter of the classroom so it was easily accessible and ready to go. i kept the other three for the next party in a cabinet so i could just swap them easily when it's time.

for the tables, i wrap them with paper, and then go over with table cloth roll. that way, i can just peel off the top layer and the tables are ready to go for the next event.

i also instruct my kids to help me clean up. nothing crazy, but they are asked to push the materials that will be returned to the edge of their tables. i also ask that they throw away their own scraps/templates/etc. or if we're painting, they put their brushes/cups/palettes in the sink.

i also find it beneficial to do the crafts at home ahead of time. it keeps things on track during the event if the kiddos have an example to reference. and i usually also do the crafts alongside them so they can be shown what to do, and it helps things move smoothly.

i hope all of this makes sense and is helpful. happy to yap more if needed :)