This may be common sense but I bet there are a few people out there who don't know this. Basically you can refresh the expiration date for your Hallow's End sweets.
Here's what you need to do...
1. Put some of your old candy into your bank
2. Get some fresh sweets from a candy bucket
3. Get the sweets from your bank and put them on the fresh ones
4. Enjoy your sweets another 14 days...
This may also be a repost from other world events, if so, or the majority finds this useless please feel free to delete this post.