Interesting web sites - conference, seminar usergroup meeting dates

I am currently setting up the web site for my company, which provides client/server-based solutions. I am planning to add links to sites that provide information on conference schedules, seminar schedules, usergroup meeting fixtures etc. I am already providing links for client-server and web-related products to my site. My interest is on events that relate to client-server products, web-related products, and software development standards and methodologies. I have already visited most of the client-server product vendor's web sites and have noted that most of them offer the schedules on their web pages. I was only hoping if some site has a well-maintained list, I could provide a link to the site from my web pages. Please note that I am looking for a worldwide listing, hence I might end up setting up a number of links to put together information on worldwide schedules. Please mail me all the replies directly and I will collate them and post a consolidated one in the newsgroup later. Thanks in advance, -suresh