Mini-Games like Pong
Include mini games to bridge the waiting time until all meeting participants have joined the meeting, like the edge://surf game or pong, which can be controlled by hand recognition and can be played with other participants
Games in MS Teams would be great - e.g. "create a pong competition for your team"
A few simple multiplayer games to meet also on the more private level.
for example a "Uno" card game.