Maybe if you wait a few weeks the events will fire. New nations does not add things like "Communist France" or "Communist Italy". Instead, it adds things like "Brittany".
The best way to integrate with an added nations mod is actually to leave it all out. Then download my Cold War Tech tree and use "1936 User mod" which is designed to allow use of SMEP or a variant. Then you'll get not only the added nations but also an extended techtree. In New Revolters I have indirectly added Communist France through the creation of Free France and Italian Social Republic has a left-wing leadership as well as the rightist one. Usually you won't need left-wing Italian Social Republic though. You'd have to write events to release either though, as they are not part of SMEP. Alternately you can patch in some of my release events. By the way I also added Communist Japan.