I'm curious about this too. I rather assume if you are doing poorly in Fame, by failing or missing jobs, other ones pop up that you can take. There are a lot of stars that I never got texts about. So, methinks if you are doing badly, you don't get to go on things like the ski trip, as there is one on the 21st as well, I think. Or it could be if you are in no relationship, and the 25th doesn't mean anything to you, then the audition for the 26th rolls up. If you find out, please let me know. I am eventually planning to do a "No Voice Acting" playthrough so I may find out then.