Frankly no I don't trust everyone's blogs to get the event markup right. There's a lot of fields, and a lot of ways it can go wrong. IndieNews works this way and it's hard enough for people to get that right, and that's just a name or content property.
I'm going to add an "Import Event" button to load an event from a URL with Microformats, so if you want to you can post the event on your site and import it, but it will preview what it found before actually creating the event.
The other factor is that one of the primary goals of this site is to lower the barrier for people hosting events, and that means not making them think about markup at all.
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