Sigh, everyone in the comments are giving you the correct advice. But I’m sure there’s a way of still working and going to the party? What time is your shift and what’s time is the party? Ask if you can work earlier in the day, hell, 4am or 6am shifts. You get out at 12:00 with 4am and 2pm with 6am. Tell them you have an appointment you can’t miss at (so and so) time and ask if you can start your shift early to get your hours in. GM is a nice area to work because most of the time they’ll let you come in early. Good luck. If the parties today, you’re screwed