Character meets - Trolls?

Hi Everyone. Does anyone know if the meets and greets at Universal are as busy and crazy as the ones at Disney? Is there anywhere to get a schedule/locations, and has anyone been recently and seen either Trolls characters or Scooby-Doo? Trying to find a way to work this into our touring plans.

In my experience, the meet and greets are nowhere near as crazy as Disney. I have been told that there is a guide available that shows the times, but I have never used it. For my family, Transformers is always a priority, and they meet at the same place, fairly consistently, all day. then we just wander through Marvel Superhero Island and other areas and happen upon various other meet and greets.