I went up there with my d60 and 18-105 lens and mounted sb600 on 5th July. My stuff was in a normal messenger bag.
While I was there, a couple was getting the outdoor wedding shoot done, the photographer had a big mama lens and flash on - that i would say is professional photography of sorts.
Also I saw and ang moh lady with a nikon d300 big mama lens and a tripod - a proper big tripod not the kind u can hide in a bag taking long exposures.
As long as we can reason with them that we are not professional - ie going to sell the images etc or print them in magazine it should be ok..honestly i can shoot a PnS at 14 mega pixel and have the pics printed in a magazine as long!!! DSLR - no longer equates to professional photography.
My advise just take what you can very discretely no need to ask ..cause they rather say no to you than get trouble from their boss for letting you go.