And any suggestions for questions to ask professors?

I am a Biomed Eng applicant if that matters.

Ask them what you want to know. Are you choosing a grad school? If so, what is important to you. Resources available, lab working environment, expectations, opportunities to collaborate with others, the aims of the research group... Just some ideas! You can ask students what you can't really find out from the professors. What are they like to work with? Do they give proper feedback? What is the one thing you would change about them?

What research group would you be part of ? (it is not always obvious)
What equipment do they have/lab space?
Whatever you are interested in and they like talking about.
Also talking with their current grad students gives you the real story about how good they are at actually supervising

you are going on a weekend?