My silly darlings let me offer some advice if you'd like it. This event is a goldmine. If you are getting really great rewards that you can't use, don't sell them. Hold them. Right now things are selling for a fraction of what they will sell for now.
There are gold godstones selling for 1-5 mi. Protectorate keys are selling for 5 mil in blue and 14 mil in gold last I looked. These are going to VASTLY change in value.
I know having fast money seems good but stop and think what your goals are. If you need money now because the thing you want is going to be gone - go ahead and take the hit.
If you can wait even a week past the end of the event you'll be very glad you did.
In the meantime. BUY. If you HAVE some money, find things you'll want later. Me? I like dyes. I'm buying dye bundles like a mad thing. I'm buying keys because I'm working toward my mythic pvp stuff. I'm buying godstones to sell LATER, tuning scrolls to sell LATER
The things I'm selling are things that have nothing to do with the event. Skins, pots, 1 hour scrolls, manastones...
Take a moment to think what happens when a ton of people get a shiny new weapon. They buy manastones and enchantment stones to pimp them out. If you have those things - now is a good time to sell them because the next event might be stones lol.
Anyway. I hope this helps. Patience my darlings.