Is adding my location (city, state, zip code) mandatory?

It is always recommended, but only mandatory if the host chooses make this required.

The host has the ability to customize this requirement for the registration in the event. If the event host choose to make this mandatory, it will be required for you to add this in order to complete registration. However, even if this is not mandatory, we recommend adding your location as it will only help the during the hiring process.