Marugame Udon Partners With Oceanic Society For Earth Day Restaurants will donate 20% of day's sales to help improve ocean health, save marine wildlife News provided by Share this article Share this article DALLAS, April 14, 2021 /PRNewswire/ -- Marugame Udon, the world's No. 1 udon concept, will celebrate Earth Day by partnering with Oceanic Society. Twenty percent of every guest purchase made at all Marugame Udon locations on Earth Day, Thursday, April 22, will go toward raising $10,000 for the Oceanic Society and its Blue Habits programs that support ocean health. Additionally, on Earth Day, the first 100 guests at each location will receive green udon noodles, colored with spinach powder, to commemorate the partnership.