Join (with)

• Group gathering
• Connect (with)
• Gathering of people with a shared interest
• See some friends at the bar, say
• Group get-together
• Social gathering
• Grab a beer with some friends, say

Wikipedia Word definitions in Wikipedia
Meetup is an online social networking portal that facilitates offline group meetings in various localities around the world. Meetup allows members to find and join groups unified by a common interest, such as politics , books , games , movies , health , ...