Just for Festivals & Venues ... here are a few ideas. I do have tons more but these are more worthwhile :
links/LinksByCat.cfm?CategoryID=20&LinkCategoryGroupID=6 About the best UK festival listing site I've seen : UK Folk Festivals Scotland\England\Ireland\Wales\This Month\The Big List in date order “We aim to list almost all the festivals in the UK. We have arranged the festivals by country and by date, as well as our famous Big List which covers all those festivals that we know about. Festivals starting within the next five weeks can be found on our This Month page." www.ukfolkfestivals.co.uk/