God Himself has arranged times to meet with you… Times to celebrate. The implication is that a time of rejoicing was set aside by God for His people. They are times that He calls US from our everyday life to "halt" (stop) and to submit ourselves and dedicate all our spiritual activities to these “Holy Days” and to Him.
They INTERRUPT the ordinary occurrences & activities of our Life & give us the Spirit, Power & Consecration for the FUTURE that God has for us.