Catholic Mass, also known as the celebration of the Eucharist is the central act of worship that is open to anyone around the world. The Mass incorporates the sacred scripture also known as the bible, prayers, sacrifice, hymns, sacred food for the soul, and teachings on how to live a virtuous or Catholic life. This is a great opportunity for one to fulfill the third commandment and/or learn more about catholic traditions.
The link below gives a step-by-step description of what to expect in a Catholic Mass
https://www.usccb.org/offices/public-affairs/structure-and-meaning-mass