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You can use a calendar to store team events, including meetings, social events, and all-day events. You can also track team milestones, such as deadlines or product release dates, which are not specific to a time interval. With a calendar on the SharePoint site, you and your colleagues will have easy access to common schedules and dates.
Watch: https://support.microsoft.com/en-us/office/video-create-your-own-sharepoint-calendar-c725a546-31e9-4096-a54d-ac7c8eca41ac
Watch: https://support.microsoft.com/en-us/office/video-adding-events-to-a-sharepoint-calendar-0e29de9d-6970-4343-960a-49211d069201