From several tours to Europe with maybe most of it in Amsterdam, I have attended the Queens Birthday at least twice.
You read about warnings of pickpocket, but I never actually came across it. I was there for several months at a time.
People who have must have spent too much time at the coffee shops.
At that point, they could pick your pockets after they have your pants.
You have a rain cover to camo the bags design.
You also need hooded raincoat in most cases, and it can be used in any fashion to cover the bag to down style your status.
If you loosely attach $100 bills to your outfit, some might be missing.
The main tactic I use is place gear bag into the cheapest overhead style roller bag.
Pick these up when you get there. Or before. Try to fit in as a local.
You more than likely will need it to pack what you picked up on the tour.
Don't open bag exposing gear in dense zones.
I wear rain coat or trench coat where I can sling camera out of view under coat when out of the bag.
So leave the bright Canon straps at home.
When it's time to head to the airport, gear bag goes into overhead roller bag, and then over head.
I have to admit, it's a total pita going through security.
I have been pulled out of line to be searched in Holland before getting to ticket counter with military guards sporting M-16 style gear.
So do get there early. Slight handicap with language can get in the way sometimes.