"visit classes" is correct and usable in written English.
You could use it, for example, in the sentence "I visited classes at the university to decide what courses to take next semester."
Parents visit classes regularly, checking attendance and observing lessons.
Alternatively, Haas librarians are available to visit classes or seminars as requested.
Prospective students are strongly encouraged to visit classes and/or schedule an informational interview with the program's faculty and administrators.
Mr. Garcia Lastra invited me to visit classes a few days later, where I saw everything from a carpentry workshop to a lesson on Leonardo da Vinci.
Guest artists will visit classes and share some of the directorial, collaborative and interpersonal challenges involved in leading a significant creative enterprise.
The day's program offers opportunities to visit classes and design studios, meet informally with faculty and students, tour the School and the University, and attend the School's evening public lecture.
For more news on the many achievements and activities of Law School alumni, visit Class Notes online.
NYHA functional class was determined at the outpatient visit (Class 1, no functional limitation; Class 2, slight functional limitation; Class 3, marked functional limitation; Class 4, inability to perform functions without symptoms) [ 24].
We visited classes and led brief group discussions to combat these reasons and create a descriptive norm favoring turning off lights.
They visited classes, interviewing students, teachers and parents.
She explained the whole process and what would take place with home visits, classes, and paperwork.
