Are there LARP events with good acting? I don't know if it's a case of silent majority or whatever, but I can't say I've ever heard a LARPing story that didn't involve horrible acting.
Yes, absolutely.
LARP players tend to come from one of three backgrounds:
Gamers
Re-enactors
Amateur Dramatics
The last are the best actors.
You have to pick the right game though.
π = 4
Consider a 5' radius blast: this affects 4 squares which have a circumference of 40' — Actually it's worse than that.