[motge]

It's a good question and not easy to answer in general as there a lot of different types of hackerspaces.

Some hackerspaces are more a kind of makerspace and provide expensive, large or complicated hardware like industrial laser cutters, 3D printers, embroidery machines and (electronics) workshops with soldering irons, electronic parts etc.

Other hackerspaces are focusing more on the social side and offer a space to hang out, meet and discuss with beverages (I guess mostly mate and beer). There can be talks, workshops or competitions (like CTFs) and so on.

Also providing services to the public, like repair cafes and holiday programs for kids can be a way to further engage in society to share technical knowledge.

hackerspaces.org has also extensive explanations on theory of hackerspaces: https://wiki.hackerspaces.org/Theory