I have an acquaintance who had a grey and always had bird parties. When I was on FB, I always saw pictures with at times up to 7 or more birds. I was very surprised b/c once I started researching, I was reading that that was not a good idea.
Well, her grey got sick and was diagnosed with avian bornavirus. She was only 5, when she died. She died when I only had Levi a few months. I was heartbroken for her. But, thought to myself, no way will I ever expose Levi to other birds.
I get freaked just by taking him to the Vet. I make his appointments, the first appointment on a Monday morning. So, the hospital has the w/e to air out the germs.
So in essence, I wouldn't do it.