Summerclay  (love the name - hope you work with clay)
There is also a Courtyard right beside the Hilton.  
They're not exactly across the street if the walk matters .. more like up a (steep) block &amp; over 1/2 a block. 
There are a lot of hotel choices if you don't mind a short drive .. or using a taxi.  
Assume the taxis will be running after the show in Sept .. have seen them after Waterfront fests.  
Don't wait too long to find a room you're happy with .. there's competition from bus tours loaded with tourists looking for the colorful fall foliage in Sept.