Burger King and McDonald's are Creating a 'McWhopper' to Celebrate Peace Day By Notable Life By Notable LifeView Author|August 26, 2015|Food + Drink,View Food + Drink TrendingView Trending If you’ve jumped on the vegetarian bandwagon, you may want to consider making an exception on Monday, September 21. In the best news we’ve heard all day, in honour of Peace Day, Burger King is inviting McDonald’s to team up... View this article.