I’ve been working on a smart web app for events. It’s made for mobile, but will work on desktops decently well (albeit look a bit silly). Check it out at http://gwtimer.com or http://guildwars2eventtimer.com/
Plans for the future include alerts, integrating with GW2 Oauth, and hopefully a nice map to acompany the advanced info. Let me know if you have any questions or have some pointers.