Potentially very useful. I often attend dance exchanges; most of those going know each other but logistics are a hassle. One event organizer is currently using

Potentially very useful. I often attend dance exchanges; most of those going know each other but logistics are a hassle. One event organizer is currently using a google-doc hosted spreadsheet. Something that was announced and promoted with the event could make attendance easier (which organizers love). A web UI could help show people on the way - maybe graphically with a map, so you don't need to do any algo work. Please let me know if you do this; chebuctonian at gmail. Thanks!