The 2018 "event" was actually a long process that began with the nucleus of an idea in 2016, involved worldwide consultation in 2017 and 2018 (complemented with several synodal processes taking place in the United States at that same time, i.e., the National Dialogue and V Encuentro), resulted in an apostolic exhortation (Christus Vivit) in 2019, and continues to be unpacked to this very day.
Both the Synod and Christus Vivit are significant because they were extensive and Holy Spirit-led reflections on the realities facing youth and young adults around the world, and engaged active Catholics and those who remain disaffiliated from the practice of the faith. This synodal process was able to capture a snapshot of the global situation and resulted in the Church's landmark document on young people, Christus Vivit, with a theology and spirituality that will continue to inform and direct the Catholic Church's approach to youth and young adults in parishes, dioceses, and communities for years to come.
While the 2018 Synod and 2019's Christus Vivit were indeed moments in time, tjeir impact will be felt by the Church on the global and local levels for generations. It also gave the Church a template/model of how to engage in fruitful synodal listening and dialogue, which is always ongoing.