As a former facility manager for an industrial plant I have been through my share of fire inspections. technically power strips are considered extension cords and extension cords can only be used for temporary power. Some inspectors will let you get away with them, but it is kind of a gray area. Now especially since you are with a school district the district will probaly want to follow the letter of the law. Any way back to your original question of what you can and can't use for a couple of days. Certainly you will need some type of circulation, either your filter or your powerhead. Then what you might want to do is to plug in your lights during the day and then plug in your heater at night when you leave. I don't think you need your bubble strip at all.
Whatever is not pulgged in, with the exception of the heater, should be taken out of your tank. Inspectors are human, some will look at one thing and others will look at something else so it is best to play it safe. Also you don't want it written that you have a strip that needs to be removed and then not be able to use it at all. If they ask about your heater or light being unplugged, depending on when they do the inspection, you can just say that it is your normal procedure to run the lights during the day and the heater at night.
HTH
Scott