I know we just did World Create Day, but:
International open day for hackerspaces, 31 March 2018
On the 31th of March 2018, hackerspaces everywhere will open their doors for everyone who wants to know what real hackers are and what they do. There are more than 500 hackerspaces worldwide.
Most spaces are open from 10:00 till 17:00 local time, but check the program of the hackerspace you want to visit.