Why should trees only get to have fun on Christmas?Halloween can be a great time for Bonsai enthusiasts because their tree can easily be dressed up to get into the spooky spirit of the season. Depending on its size, you might even be able to make it a new centerpiece of your Halloween decorations. It's also another great activity for parents and children to do together, if you've got little ones.Plus, given the heritage of Bonsai, it gives you an opportunity to put a bit of a Jap …