There’s a lot to celebrate in April, according to this list of offbeat holidays—Humor, Guitars, Poetry, Honesty, Pecans, Scrabble, Tweed, my birthday, Passover—but I would be remiss if I didn’t add National Meetings Industry Month to the list. My friend Shawna Suckow, founder of SPIN and The Hive Network—taking cue from our meeting planning colleagues in Canada who have been celebrating the industry in April for the last 20 years— declared the first U.S. celebration in April 2013. Branches of SPIN held lighthearted “Cupcake Wars” across the country, bringing together planners to celebrate the hard work we do as meeting…