2010 – How to limit the column / field value based on the number of entries

I have a list that contains the preferred date with three dates like 16, 17 and 18 April 2019. I have to limit the entries by date, because for April 16, there should be 50, if the User selects again 16, we should display / display a message saying the places are filled, please choose other dates.

Regards,