Set up concurrent meetings for outside parties

I currently do the following with success: Set up RC Meetings for two outside-of-my-org parties to connect using RC Meetings. Without waiting rooms, no host required, etc, This works fine. I never attend these meetings.

I just noticed I scheduled two of these meetings at the same time (four oustide parties in 2 concurrent meetings) this week. I will attend neither meeting. Each meeting room is unique. What will happen?