Revisions as of January 31, 2012. GENERAL RULES No outside materials (notes, calculators, etc) are permitted in any event unless specifically stated in the event rules. Participants may not bring cell phones into any event room. EVENT-BY-EVENT CHECKLIST & RULE CLARIFICATIONS We've put all the information you need for each ESO at JHS event in one place. Download our 2012 Event Checklist & Rule Clarifications (Adobe PDF), complete with the time and location for each event, the number participants permitted, required and optional materials, and event rule clarifications and revisions.