April
Couple Appreciation Month was founded in 2010 by Blissful Escapes to, in the words of the company, "encourage couples to do something special to re-enforce and celebrate their relationships." Since then, the idea has caught on among both couples and singles who want to show their couple friends how much they enjoy their company.
Source: keshadaily.com/couple-appreciation-month-5-ways-to-show-your-appreciation/