amsdon:
The season in Sevilla ends in September. But the 12th of October, as it is the national day of Spain, there's normally a bullfight in Seville in the benefit of the Red Cross. This year it has not been announced so far, so I don't know if it will take place. I guess it will, but you will have to check after the summer.
Last year it was a "Rejones Bullfight" (Bullfighting in horseback). It's a very beautiful and special kind of bullfight in which the Matador rides a horse and runs with it in front of the bull. Very spectacular.

Andonius Thank you. I was actually thinking there had to be some sort of special event for the 12th. Where (which website) would you recommed I check? I have been scouring the web for a while.

Try here, they sell tickets for Madrid and Seville.
http://www.ticketstoros.com/ingles/teyci.html

andonius, whats the bottom line? id like to attend a bullfight on august 9, which tickets should i buy?