With this extension you can create appointments and display them in a calendar view.
The calendar provides year/month/week views. - (day will be added soon)
You can create different calendar plugins which show different categories for appointments or you can create one plugin which displays appointments from many categories.
You can highlight different categories with a color system.
You can download an ICS file for each event to share your appointments.
You can display QR Codes for your appointments.
The screenshots show, what you can exprect the extension will deliver.