We had quite some events with collection quest lines by now, and you still didn't manage to provide an "already ongoing" indicator there?
I take it for granted that you're not stupid; but that leaves only the option that you don't care much about your players... or is there any explanation I didn't think of?
But I'll (try to) not care too much about the collection ... here are the collectible numbers of the last event, and the former ones were no better, I can remember only one time completing it (I think it was the very first event. Somebody screwed the odds since then):
Beta: 11 10 6 4 | 2 3 5 | 0 (bought some tools with diamonds here)
Live: 4 9 8 9 | 2 3 0 | 1
That's plain frustrating. Only Santa's Buy-for-your-presents-sleigh is worse.
Thanks for providing you customers such enjoyable moments, that surely rises affection for and bond with the game