Possibly helpful ideas for the next time, if there is one.
Let everything warm up to air temperature in it's case before opening them up. Siting for a half hour or more while you set up other stuff might help. But it might also only be a short term thing.
Wipe stuff off frequently; condensation cools the surface, causing further condensation. Plus generally, cleaner surfaces have fewer "nucleation sites" for the drops to start forming on.
Get a big-assed fan blowing across the stage and angled up. Which would also draw audience breath up and away from you all.
We just played Saturday; not as humid, but hot as hell while setting up and for the first set, in direct sunlight at 93 degrees. And then the sun went down behind some trees, it was already in the mid 70s by the second set. Two of us were whupped, but our drummer was worse, had to sit out for a spell. He's undergoing chemo. I thought we were going to lose him for a while, but he was a trooper.
We also have a barrier around us, but it wasn't really needed; it's the outdoor stage at a fraternal, 25 feet to the nearest picnic table, about 20 feet between tables, about half an acre for maybe 60 people.
Unfortunately it's our last gig of the year that we will play, none of our future dates meet our acceptance criteria for distancing.