Trying to find where the "Free for member" info is located in database

We are using Events+ to manage events and Membership to manage members. One of our Admins has mistakenly marked a lot of events as being free for a certain membership level. I need to change this for each of the events that have this error. The membership level is called “Run” and its associated membership level id is “4”. I cant seem to figure out the database location that houses this information so I can make a bulk change.