There are too many literary festivals and events to list here but a good guide for the UK is British Council literary festivals guide.

Fantasycon 2010- September 17th-19th at the Britannia Hotel, Nottingham

UK Literary festivals -HUGE listing.

 

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WHC 2010 - World horror convention 2010 is being held on the south coast resort of Brighton at the Albion hotel. March 25-28th. This is the first time in its history that it is being held off N.America.

The theme will be 'Brighton shock'-a celebration of Euro horror tradition from Victorian times to present day.

...don't miss it. More information here as it becomes available.