The Feast Of The Holy Guardian Angels - 2 October

From Exodus 23:20 [1]:

Behold I will send my angel, who shall go before thee, and keep thee in thy journey, and bring thee into the place that I have prepared.

"Catholics set up altars in honor of guardian angels as early as the 4th Century, and local celebrations of a feast in honor of guardian angels go back to the 11th Century." ... "The feast was first kept by the Franciscan order in 1500." [2]  "In 1615, Pope Paul V added it to the Roman calendar." [3]

[1] https://www.biblegateway.com/passage/?search=Exodus+23%3A20&version=DRA

[2] https://en.wikipedia.org/wiki/Memorial_of_the_Holy_Guardian_Angels, quoted without references.

[3] https://www.franciscanmedia.org/feasaint-of-the-guardian-angels/