I renamed contacts as 'pupils' and 'tasks' as 'lessons'. I am trying to find a way to make 'lessons' to appear on the calendar. 

So far I discovered that only events can be visible on the calendar. Is there a possibility to display tasks as well? 

You may ask me why i dont use 'events' for the lessons. I have tired but i found that booking events takes much longer than booking a tasks. Because most of my lessons have the same name (2h lesson) just different pupil. booking the time is also fairly fixed in the 30 minute intervals. in tasks i can predefine task subject but in events i cannot so i would need to type same texts every time i want to book a lesson. another issue is the time frames in the task i have created custom field with dropdown option starting from 10:00 till 18:00 in 30 min interwals. If I would like to use events for this purpose I would be presented with 24 hours list and 59 minute list to choose from which is very difficult. I cannot edit time input to change hours to be shown only from 10:00 to 18:00 and minutes only 00 and 30. 

can anyone suggest what is the best solution to my problem? 

thanks
Justin