Customizing Calendars in Oracle Apex 5

We are trying to create a calendar application at our workplace using Oracle Apex inbuilt calendar tool. The related tables are log_mstr (containing employee attendance information having swipe in and out time) and leavetrans (containing employee wise leave information). If any one could help for the following queries.

Howto -

1. Display multiple columns in a calendar, in our case both swipe and leave related column information for all employees.

2. Increase the font size of display column value in the item type calendar.

3. Change the color of weekday heading of a calendar e.g. Saturday, Sunday in Bold Red Font Attribute.

4. Change the background color of calendar cell conditionally (using case..endcase, if..endif,...) .