Move the trading tents from Craglorn to another zone. Since they're still there, I assume this will be a recurring event. The Craglorn trial / arena / general PUG scene was completely disrupted during the event. Content creators and everyone were scratching their heads, blaming U35, but the real reason for the death of zone chat and consequent inability to form PUGs were the additional Craglorn instances required to support the event. I realise this may cause significant work, but that's IMO exactly why it would be a way for ZOS to demonstrate a shift in priorities that may generate some good will with the community. It would demonstrate that they understand something about how the in-game community works.
PC EU: Magblade (PvP main), DK (PvE Tank), Sorc (PvP and PvE), Magden (PvE Healer), Magplar (PvP and PvE DD), Arcanist (PvE DD)
PC NA: Magblade (PvP and PvE every role)