Courtney says the ETs can't attend the board meetings in physical person because military will arrest them.
Two suggestions:
1. Use a hologram like in Star Wars. They should be able to do that.
2. Phase into our reality, let us see them, and immediately phase out when the military storms in.
This wouldn't be a breach of contract because the good ETs don't have a contract with the bad ETs or human government. It shouldn't change anything about the situation, just like the "drones" didn't start the hot war (or if they did, it's not an excuse anymore).
There's no reason to not show up in person.