Would you allow this?

The after Prom ends at 230. We won't be back until at lesst 330 because its an hour away. My prom group (4 guys 4 girls) wanted to have a coed sleepover after prom and then go out for breakfast the bext day. My boyfriend of 2 years would have it at his house. The girls and guys would be in seperate rooms and my boyfriends parents would be home. I would call my mom after prom, after post prom, and when I got to my boyfriends house.I would also leave my phone on and be available all night just in case they wanted to call. If so how can I get my parents to agree?