How to control Calendar

I have 2 issue with the calendar.

1st when i click on the icon the calendar is visible, How to make it visible without click, so that user know that below there is calendar.

2nd is i want to make visible only April and May 2 months calendar only.

Is it possible and how, Any suggestion or help. Thanks

Im afraid you have to build custom date picking view to resolve described tasks.
So you may consider to use choice pills and a lot (i mean really LOT) of CSS.

This is unlikely to be possible. You can only restrict people from adding an invalid date, let’s say doing this in a form/edit screen and use CSS to disable the submit/save button when the date falls out of the desired range.

So can I like allow only certain dates using css ?

Theoretically yes, you can disable the submit/save button by CSS and only allow that CSS to come into play with certain conditions.