TechSoup has a great discussion about online events calendar tools in this week's issue of By the Cup, their free newsletter. I like the suggestions, and if you don't have such a part of your website, take a look.
Of course, if you don't want most people under 30 to come to your events, or, for that matter, anyone that first goes online to find information, never mind.
The issue of getting everything online is a crucial part of making your organization more user friendly for the increasing number of people that rely (for better or worse) on the net for their news, information, movie schedules, user ratings, shopping, and communications.
Here's the rule: If anyone asks a question about anything from now on, after you answer them, go put the answer on your website. Soon. Because someone else will ask the same question....soon.