Is NOBODY wrong in the post ? POST : Right. I go spectating theatre play rehearsal almost every day, until the premiere. I really love those rehearsals, since I want to become a theatre director and the rehearsals provide very adequate feedback to most of my questions. 

I agreed to participate in a video shoot for another theatres audiovisual play, thus missing one of the rehearsals I really love. Was not a big part, but background. They announced it in a facebook group for hobbyist actors. I forgot the target audience of that group and when I got to the video shoot and saw the room filled with hobbyist, schoolgirls and elderly theatre hobbyist. I felt like I was back in my theatre-hobby-days and I don't like it at all. I sat for a second, stood up and walked away. I did not see the producer, so I could not tell him directly I do not want to be there. On my way to the theatre rehearsal I wrote a message to the producer saying I mixed things up in my schedule and had to run. Apologised. Slightly.

AITA for leaving the shoot? In my head I prioritized the theatre rehearsal higher than the video shoot. Tho I understand, breaking a "promise" like that. There were no contracts involved.