It is a daily timed event. The questgiver will be available for 3 hours, and you have to gather the items and deliver the quest in that time. Note that you can gather the items beforehand but you won't know what items are required. Every day at 3 pm server time the questgiver will spawn somewhere, and the quest will require new items. I believe you cannot also deliver items from quests of other days on new moments Hemet spawns.
Uhm ... "somewhere" ? There are multiple spawn points ? Do you know them ? Or at least some of them. Thanx for the info so far.
Somewhere is literally all i can tell you. Every day at 3 pm ST there is a server message relating very vague info. So far I have found the questgiver in tanaris, Winterspring, Barrens and Silithus. The message usually looks something like "... find the questgiver Hemet in the south of Kalimdor". One tip I have is that so far I have found him nearby an area's city always (silithus - Cenarion hold, Barrens - Crossroads, Tanaris - gadgetzan).
I know that the squish is probably unpopular, but I kind of hope that they do it anyway. Without it you get game-breaking runaway inflation that can be too much for new players to the server. Just my personal opinion.
On the main topic though, thank you to Warmane for the events. Looks like you all put a lot of work into it and I know a lot of us really appreciate it. Happy holidays!
+1 i think the gold squish is positive thing and needs to be done again