Free Online Google Conference
Friday's sessions appear to be big picture thought-oriented sessions, while Saturday's sessions are more how-to and teacher-oriented. So even if you can't attend anything on Friday, you could spend some of your rainy Saturday learning more about Google Apps for Education.
There are about five sessions to choose from during each time slot, so you're likely to find something relevant any time of day.
Please let me know if you attend so we can share what you learn!