For the Children!
The collection won’t get removed, for sure. The Festive achievement section will, though, and there will be no more random festive loot drops. In other words: no snowflakes, no gifts, no ugly socks from random monsters.
What I know is, after the first time you can keep getting those fishy burlap bags the grawl hid in the JPs. After the first time, you start getting valuable junk items. And I bet those fishy burlap bags will be removed after Wintersday ends.
I’d hurry and get the last one, if I were your friend 
Edit: Those fishy burlap bags drop from treasure chests, too! That might make it easier!
(edited by Seal.5964)
Is your friend available today? I’ve got the next few hours free and would enjoy helping him get to the Orr chest near the Grenth tomb. It will be an adventure! He may die (a lot) along the way, but I will pick him up. I have any prof available to aid but would suggest I use either my super support protective Guardian or my stealth-providing Thief, those being my two world-complete alts.
Just PM me here, so as to give me an alert to the response whilst I peruse the forums, and we can have a fun, if panic-filled, dash through Orr and any zones on the way to it that he needs.
Yeah Seal, that was my concern, the collection would surely stay but the items to complete it probably will be removed.
Unfortunately he isn’t Donari, he doesn’t play everyday. I got a thief too, i would feel bad if you had to help him and i would just sit at WvW defending towers or something xD I told him about it before, that i would give him a ride, i was just hoping that instead being now he could be higher level so he could survive easier (and possibly having 1 or 2 explored maps already on the way), that Orr environment is pretty aggressive. I did that with him in Harathi Hinterlands to get the pan for the Chef/Grawl, and right on the start of the map he was getting easily killed, in a matter of a few secs, being just ~6lvls below the zone or something, so im imagining that at his currently level he couldn’t get hit without going down. But really thanks, good to know that we still can find that kind of people around in the community =)