Add the third event to calendar before start to use the plus sign

[sergiodurand]

Considering that the calendar has room to draw up to three events for each day I would like to suggest the following pull request #220:

• if eventList.size() == 3 then draw the third event instead start to use the plus sign.
• if eventList.size() >= 4, draw the 1st and 2nd event and the plus sign.