Go ahead and open a Support Ticket from within the game by clicking your PfP, then Info, then Support. Let them know your guaranteed event ended early.

Plarium is investigating this on their end, but it doesn't hurt to get the support ticket started.  

I had the same probem as you Michele.

have send a support ticket as well

I have the same problem! I sent a ticket yesterday but it's not fixed on my account yet

Any updates on this? I created a new account and cannot find Ronda guaranteed as well.

I got a response that they know about the problem and are working on fixing it. so it sounds like it will be back at one point, so hold your ancients!

yeah I'm holding onto 14 ancients right now lol..