Absolute Ring Event

Then I'm even more confused. Why does Gaga prevent you from upgrading if your ring is tradable, if the last two days both make your ring tradable? Could he not just give you the next level of tradable ring?

This event really wasn't thought out too well.

The event was poorly designed, yes. Or coded. Likely both.
Should simply have left the rings untradeable until the "Rewards Phase", when they'd either be combined for the Absolute Ring or become tradeable separately.
That is, if they absolutely had to have such a drawn-out convoluted event...