When a user registers for an event that has any cost associated with it, and invoice will automatically be created using the settings for the event items/fields that they selected.
To determine the Due Date for this invoice, the "Invoice Due Date" field that is configured on each Event Item is used.
By default, the value will default to the day of the event, or the first day of any multi-day event. You can click into the field or calendar to change this to a different set date for all registrations.
If you would like the invoices that get created when someone registers for this item to be due on or a certain number of days after the date that they register, click Use Registration Date. The number of days will default to 0, and you can change this to the number of days you want to add to the date they register to create the invoice.
You can set different due dates for different types of Event Items - for example, you may want a single ticket registration to be due immediately, while a large sponsorship can be paid up until the date of the event. Please note that if you do set different due dates, and the registrant selects multiple items in a single registration, the earliest date will be used on the resulting invoice.