Hi Michelle!
I love that your daughter wants to meet Pete and Professor Von Drake! How cool that she has an affinity for these less well-known, but awesome characters!
I am not aware of any character meet and greets with these specific characters, but I'm going to give you a special tip that not many people know about. At
Epcot, there is a hidden spot in the World Showcase, in between the
Canada and United Kingdom pavilions, where you can meet some of the lesser known characters. There are not set dates/times in which characters will be here, but if you happen upon them when touring the World Showcase, you've hit gold. I was able to meet Gepetto, Jiminy Cricket, Big Al and King Louie at different times.
For a limited time a few years ago, Disney had Professor Von Drake greeting guests at the Magic Kingdom, so I know the costume exists.
You can use the
My Disney Experience app while you are in the park to see where the characters are at that time. You can also ask a cast member to call the character hotline while you are there to check and see if a particular character is available.
Magically,
Stacy