College Professor's Assistant & Umphreys McGee Concert

I was back in college, and I was the professor's assistant for these two physics professors. We were doing some work, and I messed up some project or grading some papers or something, so I was punished and told I couldn't stay for the Umphreys McGee concert that was happening on campus in a little bit. I couldn't stay for the whole thing. I was going with Seth and Stephen Gunther, and the professor, one of the professors who looked like Barry Trotz, came to the concert and told me I could only stay for the warm-up. I then had to leave because I was in trouble because I didn't grade the papers right.