There are a number of organizations within Raintree focused on bringing people together for the purpose of fun and socialization. The oldest and most popular of these is the Home Owners Association (HOA) which meets and plans monthly events for members. Contact the HOA to join and open up a new world of neighbors and friends.
Raintree POA maintains a Facebook page called Raintree POA Community where you can track announcements, reminders, links to meetings, and information you need.
There is also a Nextdoor Raintree page where anyone with a Raintree address can join and unofficially share information across neighbors. See the New to Raintree link for more.