You said you've "weighed the risks" and are still bringing your bird, but that obviously means that you haven't "weighed the risks" at all...Parrots are not like dogs or cats, or even rodents, as they hide illnesses for as long as possible, sometimes for months and months. So you will have no idea if any of the birds there are sick or not, nor with their owners! You cannot look at a bird and know whether or not something is wrong with them...And we're talking anything and everything, from a bacterial or fungal infection to incurable diseases such as PBFD, to other viral infections/diseases that can kill your bird quickly, such as Polyoma, Borna Virus, etc. Again, it's not like taking your dog into a pet shop. Most Avian illnesses, specifically the viral ones that kill them quickly and that will cost you thousands of dollars to even try to treat, Can only be contagious to your bird if you expose them to other birds! And that's exactly what you're talking about purposely doing! This should be a no-brainer to you...
So you're willing to expose your parrot to all kinds of bacterial, fungal, and viral diseases and infections that can be specifically contagious to him, simply because you want to? I mean even the most irresponsible and unknowledgeable parrot-vloggers on YouTube have a rule to not bring their birds around other birds, specifically to the many bird-marts, bird-expo's and shows, etc. that they often go to and Vlog from...You'll never see a parrot-Vlogger who is constantly going to bird-shows and bird-shops/pet shops EVER have their birds with them while their Vlogging from these places...Why? Because they know that this would be purposely exposing them to infections and diseases that only birds can contract, and they'll have absolutely no way of knowing if any of the birds present there are sick, nor whether their own bird has contracted something and is sick, not for weeks to months until their birds are so sick that it's often too late to help them...That's what you need to think about when you're "weighing the risks", because honestly the "Pros" to bringing him with you are few, basically only because that's what you want.
I'm not trying to be harsh or rude to you, but rather trying to get you to think long and hard about exposing your Sammy to multiple other parrots that you've never seen before, that you've never met the owners of, that you don't know the medical history of, etc. I don't want to see you posting here on the forum in a month or two from now about Sammy suddenly being sick and you having to pay your CAV thousands of dollars for diagnostic tests and the CAV having to keep him in the hospital in an oxygen incubator, etc. This is exactly where you need to practice "Preventative Avian Care and Medicine"...