Discussion: Saturday vs Sunday for 2010 event?

We're trying to figure out which day would be best to hold next spring's MoboGoGlobo! junior fundraising event. For those that need a refresher, it's a cell-phone orienteering event that pairs a local runner in Seattle with a global navigator from anywhere in the world. Here is last year's website.

Many of the global participants we had last year came via Attackpoint, so I thought I'd do an informal poll as to which is the preferred date. Last year, the event was at 10am-12pm Sunday, March 22nd in Seattle.

For 2010, which would be better? We're going the weekend of March 13th or 14th.

Saturday 10am-12pm Seattle
Saturday 1pm-4pm Eastern US (several participants in 2009)
Saturday 6pm-8pm London (a few participants from Europe in 2009)
Sunday 5am-7am Sydney (zero in 2009, but might be interested?)

OR

Sunday 10am-12pm Seattle* (daylight savings kicks in)
Sunday 1pm-4pm Eastern US* (daylight savings kicks in)
Sunday 5pm-7pm London
Monday 4am-6am Sydney

Let me know in the comments if you:
a) are interested in participating
b) prefer Saturday or Sunday

Thanks!

I'd be interested in participating, especially if it were on Saturday.

Saturday is much better for me; I'll still be in town!