SHELL 2012 (Society of Historical English Language and Linguistics):

Because of the expected electric shortage in Summer in the Tokyo area, SHELL has decided to postpone the conference until September, 2012
You might want to extend your stay in Japan since there is another related conference in Japan soon after MMECL 2011.

The English historical linguistics confererence or SHELL 2011 (Society of Historical English Language and Linguistics), a Japanese version of SHEL, will be held between 1-3 September 2011 at Nihon University in Tokyo.

The website of SHELL 2011 is here.