Cellphones operate at 900mhz/1.9ghz most of the time, so they probably wouldn't make much of a difference but it couldn't hurt.
We could also ask the Fureys to turn off their wifi and people to turn off any wifi on their phones and wifi enabled devices (computers, cameras etc).
We could also have some people go old fashioned and go to 72mhz radios and free up the 2.4 a bit. Anyone who has it could use 433mhz systems also.
I think people should avoid using DSM2 if they can. Even during regular flying, people were having issues with DSM2 dropping out, and i was occasionally having issues with DSMX (which caused 2 crashes for myself)
Someone could contact Alex Greve (does he go by IBCrazy here?) and ask for his suggestions.