I’ve just come across this excellent directory of silent film festivals worldwide, entitled Stummfilmfestivals. Yes, it’s in German, but it’s basically a set of links to festival sites plus a calendar which marks every day in which a silent film festival is taking place, as well as sorting them month by month. it covers Germany, USA, UK, France, Italy, Austria, Poland, the Netherlands and Finland. And it goes back to 2005, so you can find out about all the ones you missed.
I’ll have more on upcoming festivals in due course, but from Stummfilmfestivals you can find out more about the Regensburger Stummfilmfestival (2-11 August), the Internationale Stummfilmtage in Bonn (9-19 August), the Stummfest in Prague (30 August-1 September), Cinesation in Ohio (27-30 September), and of course Le Giornate del Cinema Muto at Pordenone, Italy (6-13 October).
The Bioscope 
An excellent site. Thanks to Bioscopic for finding it. By the way, there is a link on the home page to an English-language version. Or here it is if you want it directly:
http://www.stummfilm.info/festival/index_en.html
Thanks for spotting the English language version. The calendar, which is so useful, is only on the German pages, however.
Thanks for the plaudit.
I made a quick check how to create an english version of the calendar. it was quite easy (except some comments):
http://www.stummfilm.info/festival/2007/index_en.html
If you look for a print version, please check the pdf-symbol in the upper right corner (but with German holiydays and some dates are a bit ‘crowded’).
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That was quick work! Glad you were reading and could make the change for monolinguists like me. It’s a good service that you provide. I’ve added the address to the Festivals links on my site.