We don't have all the answers...

Issues:

• privacy: many events are private and must stay that way
• trust: who says I'm going to this meeting? who said I was there?

A major problem is identifying events: events don't have URIs:

How can I say: I'm going to the same conference as you are?

• by homepage/url?
• by a query matching on time and place?
• using some sort of fuzzy matching?