I’ve created a public calendar for the amateur radio Nordic Activity Contests on VHF/UHF/SHF. The regular Tuesdays and Thursdays are set to auto-repeat, but the fifth Tuesdays are updated manually (for now, about a year into the future).

Get it as a stand-alone HTML page, in XML (probably the best if you want to add it to your own Google Calendar), iCalendar (for almost all calendar applications) or embed it in your own site.