Is it a bad idea to take Mushrooms for the first time at a concert?

My friend (female) and I are interested in taking shrooms for the first time. We would do it before we go to a concert (Umphrey's Mcgee and Conspirator). I estimate that we would split an 8th and take about 1.5 grams a piece. I'm wondering if this is a good way to experience shrooms for the first time or if I won't enjoy myself. I've seen Umphrey's plenty of times before and always have a good time at their shows. Now I'm thinking about spicing things up....