Prom Hair help

Hi,
I know what I want to do with my hair for prom. The only problem is making it stay. I want to curl it and have some up some down. My only problem is getting the curl to stay. I've tried everything. The best thing i've found so far is hot rollers, but even then i have trouble. Is there any products that people use to get their curl to stay in? besides hairspray? I'd appreciate any ideas.