The Hearthstone Calendar is an effort to create a centralized place for people to discover and follow their favorite Hearthstone events, as well as give organizers a place to list their events that will reach a maximum number of potential participants and viewers. Anyone can add their events to the calendar, and it can be subscribed to or embedded into any site. There is also an RSS feed of upcoming events.
The project is still in the very early phases, but I'm making improvements on it as I can.
Listing Your Event
If you would like to list an event, just register on this site and then click on the "Add an event" link in the main menu under the "Events" link. You will be able to edit or delete the events that you have created, but you will not be able to modify other events unless you are granted special moderator priveleges.