I think this is a Bug. If you make a concert with 100k ticket price (maximum) , the attendance is higher than with lower price, and always is worth, even if hardcore fans complains.
If I'm not clear enough I can provide a Screenshot with the issue.
Edit: I gave a concert in every country and the requeriment for level up promotion doesn't pop
Edit2: Want to host a radio show with a newcomer co-host doesnt work
The "auto" feature disables randomly (training or doctor, in office works OK)