The Days Out To Hide field on the Option Price can be leveraged for early bird discounts. Once the Days Out To Hide number is reached, the discount automatically disappears from the Event registration. 

To create an Early Bird Discount Product:

1. Locate or create a Product setting the base price of your event to an amount greater than the early bird discount.  If you will allow payment of a deposit only, make sure the deposit is greater than your early bird discount.
2. Create a Product Option Group titled Early Bird Discount and associate it with your Product.
3. Make this Product Option Group mutually exclusive and required.
4. Add one Product Option Price to this group called Early Bird Discount.
5. On the Option Price record, enter the number of Days Out to Hide, if desired. For example, if your event is on the 25th, and you want the discount to be hidden starting on the 10th, then the Days Out to Hide would be 15.
6. Set the quantity allowed to 1 and make sure the Product Option Price record is Active=Yes.
7. Make sure the Product Option Price is a negative number.

Understand how the system applies the discount:
For all negative products selected during the registration process, the system will add a payment detail line to the Payment. This will ensure that the Product Details will match the Product price for the Product(s) selected. 

Example:
Typically, the early bird discount is used as dollars off of the full price. So, the Event is set up with a price of $50 (the entire registration period) and then you have an early bird discount Product Option that is -$10. But, this Product Option is only available until 2 weeks prior to the Event. In this case, there is nothing for anyone to change once setup.

So, if you register 3 weeks out, you see that it is $50 and you choose the option for the early bird discount of -$10 and now your cart is $40. But, if you register 1 week out, the -$10 Product Option is hidden, so, you pay the full $50.