Answer: Provided that you are interested and have enough free time, it would be great to discuss [insert topic here] in person.
Step-by-step explanation:
The tone that we use when writing an email depends on its recipient. If we assume that this is an email that we want to send to our potential business partner/client/employer/professor, our writing is going to be formal. Formal writing is a type of writing we use in academic work or business.
Having this in mind, there are many possible ways to introduce a topic that is going to be discussed in a meeting. For instance, we could say: Provided that you are interested and have enough free time, it would be great to discuss [insert topic here] in person.