It's cool and encouraged that everyone makes posts here on the forum.
If you want your announcement posted on the main site(headline news) and eventually have it go on the calendar (which is updated more infrequently, but I'm trying to get better about it) send it to my e-mail boz at gumby @ onthemat . com (Spaced to avoid Spambots) or use the contact us form:
http://onthemat.com/contact_us.php [2]
For the most part announcements that end up in my inbox are the ONLY ones that make it to the news page.