I agree with @Kaykedrawsthings you might want to also check with local comicbook stores. Many of them host artists and it would be a good place to connect with an artist. Honestly, if you were in my area, I'd tell you to spend a day shadowing me at a convention. Show you how I present my table, help get products ready, watch how I do sketch cards and do my business pitch, assist me during panels where I might livestream a piece of art... stuff like that.
So if you are ever in the phoenix area....
Also, Disney offers workshops, internships and shadowing at their studios, but you have to apply in advance. I hear their programs for college students are phenomenal!