I kind of missed this part of your post the first time. There is the national organization, which is a prerequisite to joining the local chapter. You get a couple of print publications each year, journals called The National Pastime and The Baseball Research Journal. Lately, there has been a rapid growth in the number of digital publications coming out, bringing the yearly number of items to read to half a dozen or more. Membership allows you to join the SABR-L listserv, which provides a daily digest of emails that usually contain a research element. It's not meant to be a sounding board like Twins Daily is, but even if you don't have research activities yourself, most days there is some nugget of interest, I find. You might find that the research bug bites you, after interacting with the organization for a while. One relatively easy way to dip a toe into those waters is to take part in the SABR biography project, which has a goal to have an online bio for every major league player - obviously some of the older players are very difficult to track down, but many recent players do not yet have a bio and would not be too hard to put one together. Over the course of years, I find the personal interactions of greatest satisfaction. Several hundred members attend the annual convention each summer, usually in a major league city, which allows for a shared experience at a ballgame. It's three days of hard-core baseball history and other research, plus trivia contests and guest panels and other features. The 2017 convention will be in New York City. Not everyone has the freedom to travel to these events, I realize. If (as you are) you're near a city that has a SABR chapter, then that is an opportunity to interact more frequently than once a year with fellow baseball nuts. The Halsey Hall Chapter in Minnesota has two meetings per year, but there are other activities like a monthly book club gathering and an occasional hot-stove breakfast on Saturdays. You've probably already investigated the chapter, but for reference here's the most recent newsletter at the chapter's website. For others such as Ben who wonder about other locations, you can take a look at the national organization's list of chapters here. (I don't think a critical mass of members in the Dakotas has ever been achieved - setting up a chapter basically boils down to a few members deciding to make it happen, which of course is somewhat of a chicken and egg scenario.) In additional to a geographical orientation of chapters, there are also research committees organized along fields of interest, such as 19th Century, Ballparks, Baseball Card History, Statistical Analysis, Latino Baseball, Science, Women In Baseball, and about 20 others. These generally conduct their business via email and the most active ones have their own publications and even annual meetings.