Feria de San Isidro The world most renowned as well as upcoming bullfighters are gethering in Madrid. Feria del Arte y la Cultura taurina (Bullfighting Art and Culture) it has 5 traditional fights.
The tour is interesting and good value for money, includes the audio guide. Not sure I'd want to go to an actual bull fight. They take place every Sunday.
Amazing experience! they have 6-7 sets of bullfighting lined up. if you can't stand the sun, get seats in the shaded section. be warned, they will not let you into the arena if a set has already begun
Important notes : if you need to go to restroom between fights , you have to come pack before the next fight begins or they would lock you outside till the next break, which is around 30 mins.