The colleagues of testevents.com set up a list of upcoming test events all over the world (testing in general and not only focussing on protocols). You can filter for several countries or categories and get information concerning corresponding call for papers. The calendar lists various test events, e.g. German Testing Day taking place in November 2013 in Munich or EuroStar Software Testing Conference taking place in November 2013 in Gothenburg, Sweden.
This list may help you to plan your attendance at important conferences and to keep the deadlines of CfP in mind. On their website you can also find some book references and magazine references, all focusing on testing. Thanks to the team of testevents.com for this useful service!