Make sure that events loaded into your model actually are in April.  I’d make a table on that same model in another tab on your page to ensure that the data is coming through as expected. 

I made it and I have it on the table in my model.

Do you have any ideas what is going on? Is need some time after adding record in source model for calendar to show it on clendar view?

Best regards
Pawel

Pawel,

You may want to check if you have a LIMIT on your model. In the Advanced settings for your model, make sure that Max # of records (Limit) is blank, and that Load Model data on page load is off (unchecked).

Thank you that was a problem.