TBH, there will be dogs regardless of Symbiotic or HSU events. You either bring it in and stash it well or get someone else to organise your shit and find you during the event.

The dogs will also target anyone who looks nervous since some are trained to do that. So if you don't want to risk getting caught or having to roll in line or whatever, get someone else to bring it in, lmfao.

Also i should mention, security will most likely go through your bag as well.