I am a local photographer and have shot in Gastonia many times. Daniel Stowe Gardens or Stowe Manor are both great choices! Also...the City Club does a great job as well
Daniel Stowe is beautiful, but if you're talking June this year, odds are they've been booked up since this time LAST YEAR. Stowe Manor might work, and if you're up to something in Charlotte, there is the Red Fez Shrine Club and also the Victorian Villa, bot on Lake Wylie.
Click on each tool to see a sample.