Hi @CaroleF. At this time, promo codes do not have the ability to be conditional (such as in this case where a discount would be automatically applied). I looked at your event and saw the option for selecting a specific ticket for a reduced price when attending multiple days. This would be one workaround or you could create a promo code for x amount which they would need to select at checkout. However, if they don't apply the discount, they would need to re-register so I think the way you have it set up now is best.
I'll open this feature request up for including conditional ticketing in the Event tool.
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