Ever wanted to tour some of downtown Delaware’s hidden upstairs spaces? See some unfinished spaces that have been untouched for thirty years? These sites and several other downtown locations not typically open to the public will be part of this year’s Main Street Delaware “Hidden Spaces” tour. Usually, nearly a dozen locations are scheduled to be part of this peek into the past. The self-guided walking tour will be held from 6 p.m. to 9 p.m. June 1. How to…