Good point and they should return their tickets because you are so right thinking they are giving them to disrupters.
No need to return. The invitation contains a website where you register your number to obtain ticket more concerned that they have shared this information with some of the terrorist or disruptors. I could not just give this information to anyone. But went thru state coordinator so it was on the up and up.
If they pull this shenanigan hope they are exposed and there is a law they can be charged with.