Retro Madrid is an annual Retro-Computer, Retro-Consoles and Retro-Gaming event that takes place each year in Madrid, Spain (hence the name, gracias Capitano Obvio...).
It follows the MadriSX, which was originally more MSX oriented.
The GUA (Grupo de Usarios Amstrad) would generally held a stand, organize conference and invite guests from other countries.