Mar10. Get it? It's like Mario, but spelled with M-A-R, and then 1-0, which fans of Super Mario used to designate March 10 as Super Mario Day. Beginning in 2016, Nintendo officially embraced portly plumber's fandom, which for you, the consumer, now means this: Sales on Mario stuff.
Of note, Super Mario Party for Nintendo Switch is marked down to $38 and some change at pretty much every big-box retailer already. Yes, it's March 9, but no, you won't spin out for hitting the gas early like you would in Mario Kart.