Hiya. Rather than just linking directly, I wanted to provide some context. Along with a group of cofounders, I've been hard at work building LuckyCal:
http://www.luckycal.com
This past July, we got lucky (ha!) and won a grant from Facebook as part of their fbFund program (http://www.facebook.com/press/releases.php?p=4821).
Here's the rub: in order to capture most of those funds, we need to have a large and active user population in Facebook. That's fine, except that my team isn't talented at competing in the attention economy that Facebook apps typically populate. Instead, we built something we'd want to use: useful, polite and non-annoying.
At the risk of pleading, I'd very much appreciate if you'd give that app a try, especially within Facebook:
http://apps.facebook.com/luckycal
Help keep a fellow entrepreneur out of the cubicles: invite your friends.
New User Experience: Requires me to give up a lot of personal info without providing me with a compelling reason to do so. Maybe this is typical of Facebook apps but it is still likely to be a significant resistance point for signing up. I wouldn't have if I hadn't heard about it on HN
Marketing Strategy: I think for this to be successful you will need to focus on groups with a vested interest in promoting themselves and their events. Think MySpace and bands or local community event organizers. You are likely to get easier traction if you focus on specific geographies - say New York, San Francisco, or your home town. These people need to get their message out so could become active super-users and draw in users of their own. Think about a local band with an existing fan base and how you could target your app to help them reach and connect with their audience.
The look and feel should be more like a Facebook app. As it stands it looks out of place. Still, nice start. Keep it up and good luck escaping cube-land.