July, while not a vampire-event-heavy month, does at least host the London Film & Comic Con. Although vampire-specific content is somewhat low in 2014, this is still a great con to attend. Buffy/Angel fans might find it worth stopping by to see Juliet Landau aka Drusilla; Summer Glau (who made her debut as the Prima Ballerina in the "Waiting in the Wings" episode of Angel); and T.J. Thyne (spotted as a lawyer/employee at Wolfram & Hart). All three will be available for autographs.
Beyond Angel alum, there are plenty of interesting classes on offer, many relating to the writing and art of comics. There are also classes on creating a graphic novel and storytelling. In addition you can look forward to Q&A with various guests (some free), zones for specific interests (books, anime, comics, video games...), cosplay, and an extensive marketplace.
London Film & Comic Con 2014 takes place from 11 to 13 July. More info here.