at the same time

coming up, there is a day where i am to be at two places at the same time.  obviously, one thing will have to trump the other and take priority.  unfortunately, the one i want to win won't get to...so i need to deal with the fact that i have to miss something that won't happen again and that breaks my heart.  hoping that things like this will be a once-in-awhile type occurance instead of a regular part of my calendar.