Help!!!! Period problem!!!!?

Ok so I started my period and I need advice with handling it!! And I'm going to a camp that runs from 8:30am to 3:30pm. I'm the oldest and other than me the oldest is 9. All these girls are YOUNG and they love me. They hang all over me. Idk what to do. And I can't tell my instructor. Don't ask why. I need all the advice u can give me about my period and dealing with it at the camp. SERIOUS ANSWERS PLZ!!!!!!! Thnx so much!