Is AUTHOR wrong in the post ? POST : Backstory,  me and my friends arranged a game night to be the day after we arranged it.  Fast forward, the next day we were supposed to meet at night and during the day, another friend of mine reminded me about a certain school event.  I've always wanted to attend  to one but I never did because I'm shy,  but this time deep down I knew I really wanted to go and I knew i was going to regret it if I didn't go.  So, in the end, I decided  to go to the event just for a few hours, and go just before the time I was supposed  to meet my friends.  The event ended up being longer than I expected it. I lost track of time and I had really bad reception, I did not tell all of my friends I was going  to the event,  but a couple  of them knew.  In the end they were upset because I was a few hours late.  Their argument was that we did arranged our game night with a day in anticipation and they thought  I stood them up because I had other better plans.  That wasn't  the case for me, I was going to go with them but the event took longer than i expected  it,  and I was planning to meet them after. Maybe my mistake was not to tell everyone  that I was going to the event for a couple  of hours. To be honest  I was having fun,  but when I noticed they  were upset,  I felt guilty for having fun.  I already apologize to them,  but I wanna know your opinions. Am I missing something, AITA in this situation?