Someone ought to hang hummingbird feeders outside the meeting places once they’re inside so they can’t get out until your concerns are addressed. The birds are “protected”, after all, and they can’t risk hurting even one.
As to why the hummingbirds are “protected”, I have no clue; they are all numerous species. I’d say the Migratory Bird Treaty Act is unconstitutional.
The list is quite extensive, and has many birds that are prolific where I live. I can’t believe so many are on this list!
https://www.fws.gov/birds/management/managed-species/migratory-bird-treaty-act-protected-species.php