Seattle Modern Excel+Power BI User Group has been the first user group in the Seattle area covering PowerPivot in 2013, and has since offered monthly events to learn and network. Microsoft has been a great sponsor allowing us to meet on the Redmond campus and providing us access to a variety of speakers in addition to the MVPs we have as frequent guests. Currently, we have around 2,500 members.
https://www.meetup.com/Seattle-Modern-Excel-Users-Group-MEUG
