i strongly suggest not to take shrooms at a concert for your first time. if you wanna take shrooms take it in a safe place with some buddies in a house. E would be better for the concert you'll love the music like crazy and u can control yourself better. ive seen people on shrooms trying to pierce their ears with knifes. although thats after alot of heads.. i vote for E for the concert and shrooms for a nice sunny day. or maybe halloween check some haunted houses if ur really daring lol thats what i plan on doing.