Beads are lovely, but not if they're beads of sweat!
I was at the First Event in Boston and ran into makeup legend Jim Bridges, who I had been introduced to years by Gina Lance during my trip to Hollywood after the Glamourcon. We got to chatting and he provided an excellent summer tip.
"Wearing a wig in the summer can be a difficult task. Not only is it hot, but perspiration can run down your face and ruin your makeup."
TIP: Just before putting on your wig, take roll on clear antiperspirant (not deodorant) and run it along the ridge (just under the tip) of where the wig will touch your face. It's not a perfect solution, but it helps.