KANSAS CITY, Mo. — Pop-up bars are once again popping up all across the Kansas City area, which means it’s time for clever cocktails, strings of Christmas lights and holiday cheer. This year, there are more pop-ups than ever before in Kansas City, with over a dozen across the metro. They’ve become one of the biggest holiday trends. Just a few years ago, the first holiday bars were taking off, and now you can find one in every Kansas City entertainment district. Their themes have become more and more creative, and there’s something for everyone, whether you’re a Grinch or...