I have added 5 calendars inside my team site, then I have overlay-ed 4 calendars insdie a general calender. But currently inside the “Calendar in View” , the general calendar (blue calendar) is not click able, and the users will not be able to see and filter this calendar events, same as for the overlay-ed calendars. So any idea how to make the general calendar click able, so users can filter this calender events only when needed.
On your main site, just create a another calendar. Which Will be your 'blue' calendar and overlay that one to your main one. Use that new calendar for adding items. Then they can click that calendar overlay and filter out the others.
If however your main already has items in it, then move all the overlays to the new one, including the main calendar. Unless there is a reason you couldn't have another calendar?
I don't think this will be possible. The blue calendar item you want to click on is in fact the calendar you're on. That is the base calendar view, and the others are overlaid on top of that. There is no place for that Calendar link to go, you're already there.
What you can do is create a new view that has the same filtered view as your base, and then change the base calendar to filter out everything, thereby not using that color or view anymore.
Hope this makes sense.