In my area, we have this newsletter called NextDoor.com. It is available to people in nearby districts for miles around your home.
ND is nationwide. One day I was lamenting about the lack of Democrats in my really red district. I was reading the usual Rethug bullshit on Nextdoor and decided to see if there were any democrats living nearby.
I posted a new group called Relaxed Dems and Progressives. The name could have been better but I didn't want it to be threatening, (now I do!!)
We have over 450 active members on our own group list. We have meetings at local breweries, picnics in the summer at the lake, an active mailing list, and last but not least work on getting out the vote. We send out reminders to vote in the primaries. Many of the people are district chairs and on boards of their local precinct. 450 people can provide many good ideas and imput.
My good friend was all worried at our first gathering that people would need a questionnaire/icebreaker list to get people talking. No one needed anything like that in spite of the careful questions we had composed and the pens we brought. The level of compatibility between us all was lovely and no one quit talking the entire time.
We Democrats and Progressives are not alone and just a few hundred here and there can change an election. Usually, the first thing new members say is, I thought I was alone...
We look up voting records of people wanting to join and screen people to prevent non-Democrats from participating in the group.