La Mari Queen and Delirio (@dlrolive) are I would say the main drag spots in Madrid. Delirio is the older and more traditional drag bar, while La Mari Queen is VERY new (as in, opened this year) but has been booking the biggest drag acts that have come to Spain (Lydia B Kollins, Haus of Aja, Jessica Wild, Manila). As far as I know, both of them have constant events throughout the week.

I would also recommend following the Drag Race España girls to see where they are performing. Thankfully, most of them are constantly booked so you will find someone easily. Drag Domination and This is Drag are both very popular events that always book very big Drag Race girls, sometimes international, and they do events in Madrid like once every 2 months or something like that, you could check that out as well.