There are some aggregators for Call for Papers. The ones I use for finding conferences and journals are:
Check them. The amount of conferences organized every month is really amazing!
Do you use other services? Maybe with a recommender system in it so that they are able to directly suggest you the conferences relevant for you?
there are many more useful tools – side trip holiday planning included, just check ABC4Trip.eu:
May both scientific inspiration and the travel budget be with you ;-)