Motion sensor burglar alarms?

Ok so I know I'm a bad kid, but it's the end of my junior year and i'll feel like such a failure if I can't throw one party, my moms going out of town, i live with my dad, but she locks up the house and has a burglar alarm, I know of and unlocked door and I won't set off the alarm, you don't need to warn me, but i don't know the code, and in the living room there's this weird motion detector and when you walk past it not only does it light up, but so does the main alarm pannel it just holds a solid red light, i'm not planning to trash her house, i love and respect my mommy, i just want to throw a party, will cops come?