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List of Some of the Big Meetup Groups Worldwidemeetup.com
New York Open Statistical Programming Meetup | 10k+ Membersnyhackr.org
Data Science Festival - London | 9k+ Membersmeetup.com
Greater Boston useR Group | 3k+ Membersmeetup.com
Analytics Vidhya Bangalore | 4k+ membersmeetup.com
Taiwan R User Group/MLDM Monday | 6k+ Membersmeetup.com
London Data Science Workshop | 4k+ Membersmeetup.com