Bumbershoot is back. It’s been a while, and the festival is under new management, but the Labor Day weekend tradition is returning just in time to celebrate its 50th anniversary. Bumbershoot is one of the longest-running festivals in the country, and, like most things in Seattle, people have a lot of feelings about it. Seattle Times Music Writer Michael Rietmulder is here to remind us of what we’ve been missing out on, and what we can expect this year.