Hi and welcome!,
I don´t know about bullfighting dates as I don´t like it, neither anyone I know, but Im trying to find out this information for you.
Just wanted to let you know, so you can check this post later.
There will be no bullfighting events until August (Malaga fair). Looks like bullfighting events are done in La Malagueta only for the Holy week in Malaga and the Malaga fair week; if you are looking for coming in August, you should get a ticket soon.
Hope this helps you!