Here are a few dates that have been provided for events taking place in towns such as Jerez, Cadiz & El Puerto de Santa Maria etc.
***All dates are subject to change and are not guaranteed***
Carnival in Cadiz is held in February
Seville Feria 4th till the 11th May 2019
Feria de Rota 1 till the 5th Mayl 2019
Feria of Jerez 2019 will be 11th - 18th May 2019
Jerez Moto GP will be 3rd till the 5th May 2019
Feria of El Puerto de Santa Maria is 29 May till 3 June 2019
Arcos de la Frontera Live Nativity scene 14 December 2019
For Sanlucar 2019 events and festivals, visit: http://www.sanlucar-de-barrameda.com/forum/viewtopic.php?f=7&t=627
Any others dates/events, please let me know.