Eventor isn’t available on iOS in the current version of Blynk, although it will allegedly be available in the new version of Blynk (known as Blynk 2). Its anybody’s guess when/if that will be available to us, and whether it will be able to run in a local server configuration.
Having said that, I’ve never had the need to use Eventor, as I prefer to do the required functions on code on the device rather than in the app.