I’m on my final write up due to performance and the last time I called out of work was in November when I had covid (which was excused). I need to call off because I mixed up days for an event I bought tickets to and can’t a refund on, and already asked people to cover with no luck. The issue is I received my final write up last week, and the event is Monday. I can’t even bother to let my manager know because all he’ll say is there’s nothing he can do (i know this based off previous experience of asking him for a day off that I had scheduled).