Tips for event promoters with websites:
If you are going to publish public events on your own website
make your markup meaningful! ... make it clear to both machines and humans what is what... - use this:
http://microformats.org/wiki/hcalendar
anywhere you publish your events.
... or post your events somewhere that does it for you.
Event listings on spraci.com are marked up in hCalendar (they have been for years), and spraci's feed aggregator can read hCalendar
For spraci listings you should also specity what city it is in - use "geo" and "hCard" under "location".