A great game like hide and seek, only in reverse!
Do not be the last person to find the group!
Set out boundaries. Appoint one child to be the hider, they must find a spot to hide and stay put. Everybody else, will wait 30 seconds with their eyes closed. On go, the rest of the players search for the sardine. When found, they join in the hiding area. The game continues until everyone has found everyone!
Tell children they are not allowed to pile on top of each other.