Possible to edit background colour in Calendar View?

Hi All. Here is my use case: we are using Smartsheet as our activity planning calendar for a team of dozen people. We have focus periods lasting from few weeks up to one month.  We would like to communicate that e.g. May 1 to May 23 is time for Focus Area#1, and from May 24 to June 16 for Focus Area #2, and so on. 

Is there a way to set these Focus Areas visible on the Calendar View by editing the day-level background colour on the Calendar View  (like now the days of the current month have a white background, the days of the previous or next month have a grey background)?