Lower teams than the ones posted here can beat the event. At the time I had:
35k, 16k, 14k, 14k with a 33k helper
My main team doesn't have too many abilities just evolved St.Paulia's 5% Atk for 3 units with that said my team is focused around St. Paulia which helps considering the boss has an AoE skill which pretty much kills the dead weight in a more balanced team set. The Helper Team I had just had St. Paulia as well. Both teams had Toad Lily in terms of utility on the stage to help deal with the pests, but luck with the RNG can negate that or better teams.

I'd wager it's one of the lower power combinations that can do it considering the pests can beat any weaker sub-team 13-14k and without some help they would have been wiped out, there's not real reason to have a secondary team at higher power than the 3rd and 4th for the event so spreading out the power between the 3 sub teams seems like it'd make it easier, but I'm going to say 2 teams of at least 30k power and then the 3 remaining teams being 15k for a little cushion making it about a 75k power event with a 30k helper, give or take abilities and unit typing.