Hi Suzie,
Ruairi from Shopify here :)
There is an app called Sale Rack that will allow you to manage this: https://apps.shopify.com/on-sale
This app allows you to schedule price changes and their expiry dates, so you could for example:
- Schedule a discount of 20% that expires 30 days before the event
- Schedule a second discount of 10% that starts 30 days before the event and expires just before the event time (or have no discount for this period)
You could also add in more discounts if there were more tiers to the pricing structure.
- Ruairi