Manage events
You can also use OSIRIS to manage and plan events such as conferences, meetings or other events. You can activate or deactivate the function under Settings → Functions → Calendar and events.

You can deactivate the Events function here if you do not want to use it
Under the Activities sub-item, you can assign the Create and manage events right to the roles so that certain people can create events in OSIRIS.
Further explanations on events can be found here.