For anyone interested in Zinfandel, you should seriously consider attending the Grand Tasting at Fort Mason on the 29th. It is the 20th anniversary of the event! Trade will start tasting at 10:00 AM and general public will be able to start tasting at 2:00 PM until 5:00 PM.
There will be a lot of people there but so will there be a lot of zinfandel.
Here is a link to official ZAP link: http://www.zinfandel.org/default.asp?cid=1&n1=15&n2=645#20414. Here is a list of the participating wineries: