It might not be possible now during the pandemic. But under normal times it could have worked to start a math group at Meetup.com and then spread that link via

It might not be possible now during the pandemic. But under normal times it could have worked to start a math group at Meetup.com and then spread that link via Twitter, Facebook, local universities etc. As a starting point 2-3 persons could hold flash talks that could spawn off into interesting discussions. A local sponsor could make sure that some food and beverages are available to the attendants. Just a thought.