721 | Tisha B'av falling on July 21 in 2018 (Date to remember) +Tisha B'Av and September 11, 2001 reminder

721... 7/21...

July 21 also directly connects to Israel.

7/21 is 7+21 = 28 (Israel = 28) (Zion = 28)

https://www.chabad.org/library/article_cdo/aid/144575/jewish/What-Is-Tisha-BAv.htm

And don't forget Tisha B'av sums to 911 in Jewish Gematria.  Think about it... the destruction of the two temples, the destruction of the two towers...