Force a draw - outside of the ::draw() method?

Many thanks for the reply, @hahakid :

One way to do it would be to load stuff on the second frame. So on the
first frame you do nothing but draw something to the screen to show it's
not completely crashed, on the second frame you initiate the load, get
stuck and eventually continue drawing.

Ok, just to make sure - this implies I should have some sort of management, e.g. via variables, to initiate loading right after the second frame is drawn, right? Say:

onClick: set doLoadHeavyStuff = true

... and then:

void ofApp::draw() {
    // rest of draw....
    if (doLoadHeavyStuff) {
      myfont.drawString("Loading...", 100,100);
      ofDrawLine(50, 50, -50, -50); // start indication
      LoadAndInit(); // this hogs; at end sets doLoadHeavyStuff = false;
      return; //bail out early
    }
    // rest of draw....
}

Also, is it OK that I hog the draw() directly as shown in the little snippet above - or would it be better that I set up an event listener, and then dispatch an event from the draw()?