Fizgig is one of the best.
Here are some more links for Lincolnshire and beyond
including Georgiansilver's suggestion

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Folk Music in Lincolnshire and beyond.
?https://facebook.com/groups/44332821748   

Lincolnshire Folk Musicians
https://facebook.com/groups/358943067527825

Folk 'Round 'Ere -
Promoting folk music, song & dance in North Lincs
https://facebook.com/Folkroundere

Folklincs
https://facebook.com/Folklincs-1826923680746409

Lincolnshire Folk Song Collection
https://archiveshub.jisc.ac.uk/search/archives/7e6c209f-ff26-31e8-b7d2-af949b55565b

Village Dance
Lincolnshire , (South) Yorks? , Nottinghamshire
..hosting dances throughout North Lincolnshire and into the Yorkshire borders.
http://brackenrigg.co.uk/avid.html
[originally 'AVID'(awaken village interest in dance)]
www.aviddance.co.uk

Peterborough & South Lincs Folk Diary -
? clubs/dance/instrumentals...
www.peterboroughfolkdiary.org.uk/index.php/regular-events-so-far
Facebook
https://facebook.com/peterboroughfolkdiary

soundLINCS
www.soundlincs.org/resources/folk-mapping/
A good map and links. The map started in 2015 & is dated October 2022 (though individual pins are undated)...

non folk
North Lincolnshire Music Hub
https://facebook.com/NorthLincolnshireMusicHub

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from UK Folk Links
www.google.com/maps/d/u/0/viewer?mid=1rbjACkYXU4E37kDuzQYwzWvDQcg
NB open in a browser

Freddy