This convention was held in 1914 between the remaining leaders of Mexico after Huerta was exiled and resigned. Huerta was forced to resign, and the leaders of the remaining factions met up to decide who would be the standin president until there could be an election. The meeting did not completely go as planned, as Eualalio Gutierrez was chosen, which upset some of the leaders. Carranza and Obregon withdrew from the convention with their followers, and Villa and Zapata formed an alliance in order to safely escort Gutierrez to the capital. 

Source:

Convention of Aguascalientes. laii.unm.edu/info/k-12-educators/assets/documents/mexican-revolution/convention-at-aguascalientes.pdf.