Every team works at a certain rhythm, and maintaining that rhythm is possible by setting up rituals. Rituals are recurring events or activities that help build relationships.
Some rituals are formal events that help keep track of multiple projects, while some are informal gatherings. Each ritual should have an agenda to make it productive. In a sprint team, the daily scrum, sprint planning, and sprint retrospection are mandatory to keep the rhythm of the team going. These are rituals.