The 54th April Fools Rallye in Santa Rosa is April 8th!
Ann and I have done this the past 5-6 years and look forward to doing it again. We are impossibly bad at it and will never graduate from Novice class, but it is still one of the best fun Sunday drives we have all year. Back roads and country lanes we never knew existed. This is an entirely open charity event, bring $19, run what you brung, '18 Prius or '62 XKE, there is no judging.
Give it a try, you will like it! Here is the flyer: http://www.sonic.net/~thebeard/WebPages/flyer.html
If you don't know what the April Fools Rallye looks like, go to the Rallye website: http://www.sonic.net/~thebeard/
If you don't know what an AB Rallye is, you can take a trip on a paper course here: http://www.sonic.net/~thebeard/WebPages/map.html