There have been some slight changes in the latest versions but setting up a General Admission event is much the same as before. You create a category and create products with a quantity. For Concessions you must create your concession products and set a Master Quantity for the residing category.

Admin>Products>New Category

New Product> write the Name ...e.g.  Adult Ticket

TYPE tab IMPORTANT: choose General Admission from the drop down menu

COST tab Insert the price of the ticket

STOCK tab inert the Quantity of tickets

SKU should always be 9 for General Admission

SAVE and Exit by clicking the GREEN SAVE button

Now go to Admin>Concert Details to set Date and Time

For a complete FAQ guide about setting Concert Details

How do I correctly set Date and Time in version 9.5?

go here

That just about sets the basics for a General Admission Event

Now go back  and upload an appropriate image for you event Admin>Products>Edit

Go to the Front End and check everything is as you like it.

NOTES:

Questions in General Admission Events