Hi Matthew!
With virtual meetings I like to do an activity that gets them up and moving (gets the blood flowing before the session). You could try doing a "Find something that..." activity where you give them a few minutes to look around and come back (play music as a timer or have a buzzer go off when times up so they have an audible indicator they need to return). Then when they return have them share (breakouts for sharing is probably best since you have 50 people).
Here are a few examples of what you could have them find. Find something that...
- Is red
- Is tied to a fond memory
- Brings you joy