Looks to be one of the larger WordPress meetup around town. Meetup claims they have 1,100+ members. See their Meetup Page. They're meeting at IgniteHQ on Waddell St. in Marietta. Their description on Meetup is somewhat generic:

We're a group of local WordPress users who get together to share our knowledge and experience, and to meet other WordPress users in the area. This WordPress Meetup is open to all who are eager to learn more about WordPress --- the software, the community, and the business!

They seem to have a good mix of technical and non-technical programs.

Events - Marietta WordPress Meetup

Events - Marietta WordPress Meetup
  • Marietta WordPress Meetup

    We’re a group of local WordPress developers, designers, and publishers who get together to share our knowledge, our experience, and to meet other WordPress users in the area. This WordPress Meetup is open to all who love WordPress — join us!

    Learn more about WordPress Meetups at https://make.wordpres...

    IMPORTANT: ARRIVE EARLY. PARKING IS LIMITED
    If there aren't any spots left, there is a public lot for $5 a block away at the intersection of Waddell and Anderson.

    You're welcome to bring your lunch!

    Marietta 30060 - USA

    Tuesday, May 14 at 11:30 AM

    2

    https://www.meetup.com/wpatlanta/events/260653373/

  • Marietta WordPress Meetup

    We’re a group of local WordPress developers, designers, and publishers who get together to share our knowledge, our experience, and to meet other WordPress users in the area. This WordPress Meetup is open to all who love WordPress — join us!

    Learn more about WordPress Meetups at https://make.wordpres...

    IMPORTANT: ARRIVE EARLY. PARKING IS LIMITED
    If there aren't any spots left, there is a public lot for $5 a block away at the intersection of Waddell and Anderson.

    You're welcome to bring your lunch!

    Marietta, GA 30060 - USA

    Tuesday, June 11 at 11:30 AM

    1

    https://www.meetup.com/wpatlanta/events/tcfcpqyzjbpb/

  • Marietta WordPress Meetup

    We’re a group of local WordPress developers, designers, and publishers who get together to share our knowledge, our experience, and to meet other WordPress users in the area. This WordPress Meetup is open to all who love WordPress — join us!

    Learn more about WordPress Meetups at https://make.wordpres...

    IMPORTANT: ARRIVE EARLY. PARKING IS LIMITED
    If there aren't any spots left, there is a public lot for $5 a block away at the intersection of Waddell and Anderson.

    You're welcome to bring your lunch!

    Marietta, GA 30060 - USA

    Tuesday, July 9 at 11:30 AM

    1

    https://www.meetup.com/wpatlanta/events/tcfcpqyzkbmb/