Reoccurring events or activities set in place by men.
παράδοσις,n \{par-ad'-os-is}
1) giving up, giving over 1a) the act of giving up 1b) the surrender of cities 2) a giving over which is done by word of mouth or in writing, i.e. tradition by instruction, narrative, precept, etc. 2a) objectively, that which is delivered, the substance of a teaching 2b) of the body of precepts, esp. ritual, which in the opinion of the later Jews were orally delivered by Moses and orally transmitted in unbroken succession to subsequent generations, which precepts, both illustrating and expanding the written law, as they did were to be obeyed with equal reverence
Matthew 15:3
Jesus replied, “And why do you break the command of God for the sake of your tradition?
Mark 7:8
You have let go of the commands of God and are holding on to human traditions.”
Mark 7:9
And he continued, “You have a fine way of setting aside the commands of God in order to observe your own traditions!
Traditions are from man, commands are from God. Don't let His commands get sullied into man's traditions (as the Pharisees did).