Location, Location, Location!
Depending on your climate and neighborhood, you may want to rotate between homes, a public place like your community park, or both.
During your trial play dates (or even before) discuss parents' and children's schedules. Finding the best time for everyone is important for a successful playgroup. Sometimes Saturday is the only available day an entire group can meet. It's also best to avoid the end of the day when toddlers are getting tired or hungry.
Once your play group has agreed to a schedule, do your best to stick to it. If meeting schedules become flexible, confusion can set in and the group's momentum may be lost.
Agree on Safety and Discipline Rules
If you're in a rotating playgroup, it is imperative that you clearly define your method of discipline and what type of behavior to consider off limits. It's also important to express the golden rule that if any kids are sick (or even if they are recovering from an illness) they cannot participate in that week's play group.
Snacks and Food
A snack break can be a fun part of any playgroup. Discuss among the parents what types of food should be served and who will provide the snacks. Rotating snack duty, even if you're meeting in a public place, is fair way to handle the task.