Also is there a way to edit what appears on the event report that you can print, and how it is arranged?
Yes. You can enter layout mode and modify the design of the layout. You can enter Manage | Database and change the underlying design of the database such as by adding new fields not part of the original starter solution.
Since the original starter solution matches up guests and contributers with events. Venues would need to be treated as an additional data source table in the system and that would require a fairly extensive design modification of the basic starter solution. You may need to invest some more time in learning about FileMaker before you tackle such a project.
Thanks for the swift reply! Do you think it's better for me to start from scratch rather than trying to modify the existing template?
I'm not sure, but it does appear that you need to acquire a more complete knowledge of how to do this. There are a number of training materials available.
The one advantage to starting from scratch is that you can build in a few features at a time, get a full understanding of how that portion works, and then move on to the next task. The downside is that starting from a blank page means that you will have to create or import every feature of every table, layout and script that you choose to use in your your database so that can take a bit of time and effort before you get something functional.