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).