I came across the following conference thanks to Kevin Goodfellow of Sports Data Hub: the Northern California Symposium on Statistics and Operations Research in Sports, to be held at Menlo College in Atherton (between Palo Alto and Redwood City) on October 16. The conference page looks a little bare, but I'm sure it will fill up soon.
This looks like it might be a good conference for me to make a presence. At $45, it will certainly be the most affordable conference I would have attended.
UPDATE: The organizer of the conference is Ben Alamar, who is the director of Basketball Analytics and Research for the Oklahoma City Thunder. He tweets that the submission deadline for papers is 1 July.