The Holy Guardian Angels Feast Day - 2 October

Quoted from Wikipedia [1]:

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...Devotion to the angels is an ancient tradition which the Christian Church inherited from Judaism. It began to develop with the birth of the monastic tradition. The feast was first kept by the Franciscan order in 1500. This feast, like many others, was local before it was placed in the General Roman Calendar in 1607 by Pope Paul V.

One of several guardian prayers [2]:

Angel of God, my guardian dear,

To whom God’s love commits me here,

Ever this day be at my side,

To light and guard, to rule and guide.

Amen.

[1] https://en.wikipedia.org/wiki/Memorial_of_the_Holy_Guardian_Angels, quoted with hyperlinks and references.

[2] https://www.praywithme.com/guardian-angel-prayers.html