"The Folk Directory"
seems to have gone off line now.

For anyone wanting to promote gigs I might suggest Ents24.
It's free.
It's slick because it covers comedy, theatre, cinema and all-sorts of music and must be making its money from advertising revenue there
but you can do a lot of fine tuning by genre.
https://m.ents24.com/whatson/search/near/petworth/radius/35/genre/celtic%2Cfolk%2Cworld%2Cstorytelling/order/date

To list events you need to sign up at
https://backstage.ents24.com
It's a little bit fiddly if you've got an artist or venue not already on their database but not bad.
It's easier on a pc than a smaller device.