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Sunday, June 21, is a very busy day. Not only will the U.S. be celebrating Father's Day, but it's also the summer solstice.Father's Day is a day to honor dads across the country, and this year they'll have a bit more daylight to barbecue, go golfing or relax by the pool thanks to the solstice, which brings the longest day and shortest night of the year.And the fun doesn't stop there! In addition to celebrating dads, you can also enjoy a refreshing smoothie, take selfies, eat cookie dough and unwind with a bit of yoga.There's a lot to celebrate on Sunday, June 21. Here's what to know.Other celebrations taking place on Sunday, June 21Of course, Father's Day and the summer solstice are two of the main events of the day, but according to National Day Calendar and National Today, other celebrations include:International Yoga DayNational Smoothie DayNational Seashell DayNational Cookie Dough DayNational Daylight Appreciation DayNational Arizona DayGo Skateboarding DayNational Day of the GongWorld Giraffe DayNational Turkey Lovers DayJulia Gomez is a Trending reporter for USA TODAY and covers space phenomena, scientific studies and natural disasters. Connect with her on LinkedIn, X, Instagram, and TikTok: @juliamariegz, or email her at jgomez@gannett.com.