I compiled the dates for Roger Lyle, TPM, NESBA and MARRC into a public Google calendar.
Since I'm selfish, this is very Mid Atlantic centric, but with TPM in the mix covers a pretty big area.
https://www.google.com/calendar/embed?src=mphr6jmf6rtpk0dvcnldg05934%40group.calendar.google.com&ctz=America/New_York (https://www.google.com/calendar/embed?src=mphr6jmf6rtpk0dvcnldg05934%40group.calendar.google.com&ctz=America/New_York)
I probably will add Sport Bike Track Time as they cover VIR and NCBike also