See link below for music in the square and other events in Ferragudo during July and August. The Beatles night with the UK band Accrington Stanley (Aug 13) will be worth a visit if you are there.

http://www.ferragudo.org/eventos/

Where is the Square info?

Sorry michael but don't understand your question.
The events are all in Ferragudo. The link takes you to the official Ferragudo dot org site where there is the listing for all the events. Those with (Largo) after them are in the main square in Ferragudo those with (Praia Grande) after them are on the beach.
The main square in Ferragudo is just over the bridge as you come in from the Portimao direction.

I beg your pardon. I thought it was referring to Carvoeiro's square

I thought it was referring to: What's happening in the square? topic