I'm sorry Mickey I understand you're sad/upset not to can go. But it's not your fault, it's that the school give you a too short time to organize it (only one day!). It's easy to miss news in a so short time. However, since it's just the beginning of the year, maybe the school will organize other things like that; you could ask your profs. Or, sometimes universities organize sort of open days, and high schools don't always know...you could look at the universities' websites, when you have occasion.
Good luck with this And don't worry, you still have time to decide.