The Ancient Caverns cap level 77 ultra cap was released on the 30th July in 2014.

On the 18th July 2014 STS kindly gave us bonus platinum for free plat offers.

On the 23rd of May 2014 STS gave us a Platinum is on sale for 40% off, PLUS level up faster with Double XP now through Monday.

A plat sale two months before the given new expansion. As well as a double xp weekend event 2 months before. And we where given double free plat awards 2 weeks before the expansion.

I'm sorry but I don't feel there has been an expansion where a plat sale is the weekend directly before any cap in PL history.