I agree with Roberto, the onus is on you as an owner to get the info.
He is right about the amount of notice for an AGM, BUT that does not have to be to each individual, a notice in the Urb for that period is sufficient.
Also there is no legal need to send any information OUT of Spain, you are supposed to have a fiscal address in Spain that all correspondence can be sent to.
Having said that, in our Community we make sure that information, ie notice of meetings, are sent out to the addresses we have on record wherever they may be. We also try to give about 2 months notice ( to the individual ) of the AGM....................................................and they still moan!!
Best to keep in touch with the developer and keep your ear to the ground!!