Limiting playdate interaction

Interacting with just one other child is a big deal for a toddler – inviting more than that may make it impossible for them all to have a good time.
From: All Good Articles.com

Sharing and playdates

Playdates can be a drag when kids haven’t mastered the art of sharing. When it’s your turn to host, go through your kid’s toys beforehand, asking her to pick a few special things she’d prefer not to share.
From: Parents Connect.com