Wanting to go out but strict mom

I have a strict mom that only lets me go out once a week for a few hours. She’s in a different country right now for week; where the time difference is 16 hours. When it’s night time here, it’s day time & vice versa. There’s a party tonight that I really wanna go but I’m nervous she’s going to find out. Keep in mind I’m 18 years old & about to move out of state for college in 2 months:/ My plan was to leave at 11:30 ish when my brothers go to the gym(so my dad wouldn’t think anything of it because by the time I come back, hopefully he’ll be asleep)