Talk to Sudden about tweeting! Maybe even in Swedish! There isn't really a central "Thomass organizer" but he's the guy leading the charge on that stuff.
The aweome new Thomass website (developed by Hammer and Sudden) is currently accessed from the
Orienteering Ontario home page through a link in the Thomass article under "Featured Events". Longer term (meaning "when more volunteers come forward"), we're aiming for an easy-to-remember Thomass-specific domain that will take you to the site above.
In the meantime, Hansel is right. If you are interested in all orienteering events, including Thomass, the Orienteering Ontario events calendar is the place to go.