Try the BBC website for the Radio Scotland folk program presented by Archie Fisher. A 2 hour programme thurs nights repeated sats with a weekly folk diary that is accessable via the 'net. Also via the BBC website, Radio 2's weekly National (english bias however)folk program on wed nights, presented by Mike Harding. Unlike Radio Scotland there is not a specific diary section in the programme, but I believe that the website does give more diary type info.

Furthermore, many of the BBC local radio stations have folk programmes, info from which should also be accessable via the BBC website