I don't know about a theme, but phrase "Freaky Friday" comes to mind pretty quickly. Friday, the 13th or not - that pretty well describes any first Friday at the start of school. If you are into alliteration, "Faculty" and "Festivities" also start with F's if you want to stretch out the name.
The recent movie by that name featured "luck" in the form of the fortune cookie that started it all.
Not sure where any of this fits, but it's some brainstorming to get things rolling.
we will be going back to school on monday, august 9th. that friday after the first week of school we always have a staff "survivor" type party. this year it falls on friday the 13th. i am trying to come up with a theme name, title or something in the way of good luck this year, no bad luck at hidden lake. something, please help me. thanks cw