RedRedWine, I moved your topic here to the "About Spain" category as that's where you'll find information about Spain's holidays and festivals - including the festival of Madrid's patron saint, San Isidro. I just did a SEARCH of this category, used keywords
MADRID ISIDRO and found about 10 threads on the topic. Hope it helps you to make your decision but maybe others can give their opinions on whether it's worth "seeing" or not.
Saludos, MadridMan
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