I would guess most of the event stuff not worth getting, for example it will probably work out cheaper to buy improved stores for gc rather then spend pumpkin on them. We just don't know yet but I would have to hazard a guess that pumpkins be around 100gc each this year, so if you want to buy an improved store for pumpkins in my opinion you would have to be mad.
But I also think that we should wait and see what happens, again I would have to hazard another guess that the event will start a week today.
One of the biggest things in an event is planning, for example a few of us are planning running tomb raiders just for lots pumpkin at a fast rate. I wish to point out that none of us are particularly happy with tomb raider due to terrible loot but what we need is pumpkin and the sketchy information we have now points to tomb raider be the adv to do to get pumpkin.
I also see in the build up to every event these same sorts of pre event whines that it to hard, well sorry maybe you should not expect to get every reward on offer.
And if above all else fails and I cant get enough pumpkins then I have a fail safe that I have been stockpiling for the last month (Halloween falls same time every year so again players should be planning) high end resources to sell to buy pumpkin regardless of how much they cost.