Money McDonald’s deal for Mercury retrograde: How to get a free McChicken or McDouble Tuesday, Wednesday May 9, 2022May 10, 2022 Kelly Tyko, USA TODAY Comments Off on McDonald’s deal for Mercury retrograde: How to get a free McChicken or McDouble Tuesday, Wednesday McDonald's has a deal on its McChicken and McDouble May 10-11 to mark the Mercury retrograde. Get a sandwich for free with a fry purchase on the app.