Google/Groups

Google Groups

Google Groups - https://groups.google.com

Create and Browse

Create / Browse Google Groups - https://groups.google.com

Calendar

Use Google Calendar with Google Groups - Groups Help - https://support.google.com/groups/answer/60652?hl=en

Embed

Insert a forum into a webpage - Groups Help - https://support.google.com/groups/answer/1191206?hl=en