connectDaily allows you to post events directly to your Facebook and Twitter accounts. Using connectDaily, you can create a scheduled campaign of posts about a specific event. For example, if you have a major event, you can post the event to your Facebook account immediately. Then, 6 weeks before the event you can make a large post about the event to encourage people to sign up. You can post a reminder 1 week before the event, and finally, you can send out a message the day before the event.
Visitors to your calendar can also Like or Tweet about events.