The event module is very flexible, here are some ways your events can be set up:

Single event

A simple event, paid or free, users find and subscribe and pay if required.  

Events over multiple days 

Setting up an event for a global band tour and they are playing for 3 nights, add a single event, then add multiple show times (add multiple dates and times to an event).

If you do not check the checkbox that says these are "free with parent", then each of the dates/times you add becomes a separate payable event i.e. Users are not automatically enrolled in ALL of the dates and times only the date they select (a drop down of different event dates shows up) and it also shows when all tickets are sold out.

Courses

Use the event module to manage in person or online courses, simply create the first event, put in details about the course and then create all the course dates and times (add multiple dates and times to an event) and flag these as "free with parent", this means that when someone joins the course, even if halfway through, they are added to the entire course and ALL the dates and times. As you add a new Date/Time, all the users enrolled in the course will be added also.

Hybrid

Have a Course that needs a combination of these? Setup a sample course and a paid course. It's easy to copy a course and have different settings for each part of the course, also modify all the details of a specific date and time, by default it inherits all of the fields from the master (parent) event record to save you from having to enter the details, all of this can be overwritten.

'Child' courses cannot have additional child courses.