bluegrass ... idk
I wonder if you'd get any leads from
https://nuitlife.com/london/live-music-bluegrass-london

or
https://britishbluegrass.org/


~~~~~~~~~~~~
This is the "what's on" page for Cecil Sharpe House
https://www.cecilsharphouse.org/csh-whats-on
On the exhibitions page it says that "...Cecil Sharp House is open: usually 9am–11pm, seven days a week."
Library times are on the VWML page
https://www.vwml.org/
roughly TuWeThFr 9.30-5.30

Contact info is on
https://www.cecilsharphouse.org/csh-visit-us