Preface: Iām a creator as well, so to speak. I have made events like this before, so I know the effort that goes into these sort of things.
imo thereās more than enough potential spots to host such events. The issue is it feels like nobody bothers to look. I apologise for being blunt here: But youāre telling me that out of an entire world that is, most likely, the BIGGEST digital playground in the MMO genre that thereās nowhere else to host large events besides:
Tian Monastery
Tian Monastery
Tian Monastery
Tian Monastery
That one town in Uldum
Tian Monastery
Tian Monastery
Sometimes that other pandaren village also in Jade Forest
I find that hard to believe. Iām more of the thought that most people just do their stuff in Pandaria because itās where everyone else does it. And as the OP suggested I feel it massively waters down the world and backdrop if you use an extremely distinct, exotic location (Nevermind that itās often sacred ground which I would find problematic on certain characters of my own) for something that has no relation to the backdrop at all.
Hosting stuff in Tian Monastery constantly is the equivalent of holding similar events in Stormwind Cathedral, or (As a more blunt example) Utherās Tomb, to put it into perspective. I am positive if people dug around you could find plenty of potential venues that are open to both sides and arenāt a wee bit concerning for the locals.
Off the top of my head some ideas come to mind:
That scarlet cathedral in Plaguelands (Requires one questline to unphase and remove hostile NPCs, occasionally used for paladin meetings but so long as dates donāt cross over I doubt anyone would mind). Just say itās somewhere else IC. Make it apparent itās not a cathedral even if youāre just using the interior.
Dalaran. Both old and new have some large spaces you could use. New tends to be used as an RP hub on tuesdays and thursdays. Portrait room or purple parlour are large enough and then you got the streets outside.
The multitude of ships dotted around the world. Boat party anyone? Some places have massive ships side by side. Iāve used one for a wedding before. If it gets cramped just set up teleportation circles between the ships so people can spread out. No NPCs on most of these. Blasted Lands Post-WoD is ideal for this.
Vashjāir. Speaking of boats, underwater ball in a āreclaimedā palace at the bottom of the sea sounds dope. Naga NPCs are very spread out and can be killed immediately. Iām positive thereās at least a few large areas devoid of NPCs altogether. Phasing may be an issue but completing a Cata zoneās main quest lines doesnāt take long at all these days.
Tol Barad I think has a fort somewhere? Not been there in ages but could be worth a gander.
Greymane Manor. Again, say itās somewhere else IC. Itās not even phased afaik like the Cathedral in Gilneas is. Posh noble with no interest in the faction war wants a party, boom. Done.
Draenor has a number of cool spots. Just say itās Outland or some other place IC. The massive draenei hub comes to mind. Though itās likely Alliance only. But frankly most of the neutral events are 90% Alliance anyway. Iād have to revisit to name any specifically as names escape me.
I can probably find more if I spent time looking in-game. Point being these other spots do exist, and while I understand a lot of work goes into hosting large scale events already (Been there, done that) I donāt feel it excuses recycling the same spot over and over. Especially one that comes at the cost of watering down the importance of in-lore locations. Neutral or not, just go out and look and Iām sure you could find somewhere else.