Happy Summer Valentines Day
Happy Summer Valentines Day is held on August 14. This event in the second decade of the month August is annual. 
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Happīsamābarentain is a single that wasreleased by the creator of Prince of Tennis, Takeshi Konomi himself. Since his release, other characters have also made their own versions.
Happy Summer Valentine (テニスの王子様) — established by the Japan Anniversary Association in 2018. The tradition started in 2004, when Prince of Tennis fans would send chocolate to their favourite character by way of POT’s publishing company Shueisha.
The Japan Anniversary Association has officially designated 14th August as “Happy Summer Valentines Day”, thanks mostly to Takeshi Konomi’s “Prince of Tennis” series. As many fans of the series know, 14th August is the day when the staff of “Prince of Tennis” release the results of the annual “Valentine Choco Ranking”.
Similar holidays and events, festivals and interesting facts
Vinyl Record Day on August 12 (organized by a US non-profit organization dedicated to the collection of music, culture and sound preserved on these media);
Middle Child's Day on August 12
Relaxation Day on August 15
August Restaurant Day on August 16 (is occurs once per season. The third Saturday of February, May, August, and November);
Men's Grooming Day on August 16
Tell a Joke Day on August 16
Langeooger Drachenzauber on August 16