You might think you know what you’re doing this Halloween, but unless it involves a candy maze and an edible meat sculpture, you may want to head to our favorite century-old factory building in Maspeth, Queens, instead. Friday, the Knockdown Center is hosting the opening of “Maybe I’m Amazed,” an installation that, true to its name, will involve an actual maze made out of giant wooden planters loaded with Circus Peanut candies in lieu of soil. The maze (a tribute to Batty Langley, a Gothic landscape designer) is just the start of it. The real kicker is the séance involving a shape-shifting, globe-trotting tree trunk.