SkyDrive is now OneDrive, and SkyDrive Pro is now OneDrive for Business. Read more about this change at From SkyDrive to OneDrive
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, that 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.