Summer is the time for Malaga bullfights
You can watch bullfight during the season (July - August) at Plaza de Toros de La Malagueta, the famous bullring that is in the center of the town. Here is a good site with all logistics and ticketing info.
Malaga province also has active venues
There are other bullrings in and around Malaga, though none as grand as the Malaga bullring.
- Benalmadena bullring has been razed to the ground.
- Mijas hosts pretty uninteresting and low key fights.
- Torremolinos has an active Plaza de Toros.
Bullfighting is now less popular with locals and tourists and so it is not easy or common to find a lot of people who are interested in this tradition. Local authorities have stopped subsidizing infrastructure and so bullrings are slowly being eliminated in favor other facilities like playgrounds and schools. Even Malaga bullring today is known for the concerts it hosts rather than for the bullfights.