A talk around the seven moedim, or appointed times, God has made with everyone. Each of the seven feasts that Y'Hovah commanded us to keep has immense prophetic meaning - telling the story of God's plan for us, from the death of His Son Yeshua, to His second coming and Millennial Kingdom reign.
Those who don't celebrate these feasts and don't know their meaning but instead celebrate the world's feasts, which was never commanded, miss out on God's message completely.