I don't know if you know it or not - I imagine so - but this Saturday's bullfight is part of the monthlong Fería de San Isidro festival so getting tickets is tough. There've been TV reports of scalpers outside selling fake tickets or real tickets for very very high prices so beware. Sorry to worry you.
Oh, and I'm nearly certain the Las Ventas ticket windows open at 9am (or is it 10am?). Not sure what time you arrive on Saturday, probably 8 or 9am, well if you can get to Las Ventas directly you can see if there are regular tickets available through the ticket window. If you go any later there'll be a long line.
Saludos, MadridMan
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