Is there a weblink anywhere which describes the different activities associated with the Festival this year in Madrid? Thanks.

As far as I know, there's no "official" website with activities but there may be some useful information on the City Hall website @ http://www.munimadrid.es . Also, check out John Ross' website (he attended the 2003 "Party with MadridMan in Madrid"!) and page on San Isidro @ http://spainforvisitors.com/archive/features/aa042901a.htm

Good luck! Saludos, MadridMan