THE FOLLOWING SUGGESTION IS FOR INFORMATION PURPOSES ONLY!!! THIS SHOULD NOT BE CONSIDERED AS ADVICE OR INSTRUCTION!!! If this is a regular concern for you, you may be able to reach a compromise with the local fire authority and install heat detetector in place of smoke detectors. Completely turning off a fire alarm system is a violation of so many codes (read NFPA 72 for info on fire alarms and NFPA 110 for info on life safty systems as it applies to gathering places and public buildings) and such a leagal liability it should not even be considered. However, using heat detectors would eliminate false alarms from your fog and still maintain coverage of the area in question. THIS SHOULD ONLY BE DONE IN ACCORDANCE TO LOCAL CODES, BY A QUALIFIED FIRE ALRM TECHNICIAN, WITH APPROVAL FROM YOUR LOCAL FIRE MARSHAL, INSURACE CARRIER AND POSSIBLY OTHER PEOPLE. THIS IS DEFINATLY NOT SOMETHING FOR A STUDENT TO DO, AT ALL, PERIOD. EXCLAIMATION POINT!!!!
Luckly for the world, the second a pair of dikes goes near a fire alarm cable and severs anything it goes off. And yes, heat detectors are a great thing, I'm of the feeling install both that way you can still have the smoke detectors but be able to shut them off when you are hazing, turn them back in at the end of the night.