The Otoño en Primavera (Autumn in Spring) Festival is an annual season of cultural events which takes place in the spring. Organised by the city hall of Madrid, there are 34 performances happening; ranging from theatre and dance performances, circus acts and concerts. The performers come from a number of different countries, as well as locally and nationally. One highlight promises to be the talk and demonstration by Laurie Anderson one of the most revered contemporary audiovisual artists. She will be at the Matadero on 31st May. Additionally there will a series of workshops and courses in the performing arts for both adults and young people (around 25€-50€ and you need to sign up in advance).
Tickets prices vary depending on the event and there will be a number of free ones. If you buy your tickets in advance before 11th May, you can receive up to 50% off the ticket price.
You can get more details and the full programme here. It's in English too!