There’s a nice, little show running in the 6th Street Playhouse Studio Theatre right now. You’ve probably never heard of it, though it’s been around a little over 20 years. In those twenty-plus years, it’s been translated into 23 languages and been produced all over the world to the tune of about 500 productions. Just this year, it’s played or is currently playing in such far-away places as Australia, Brazil, the Czech Republic, France, Hungary, Israel, Italy, Kazakhstan, and Romania. Which brings us back to Railroad Square in Santa Rosa, California, where Visiting Mr. Green is running through April 2.