Create an interactive calendar database with PHP and MySQL

Description

I am looking for someone to be able to create a calendar function in php that integrates with a mysql table.
The basic function is a front end calendar that retrieves and sends data to and from a mysql table to create a calendar schedule for an individual user.
The inbound data from MySQL to the calendar is very basic data from a table that has been populated through a different function, however the user needs to be able to demonstrate their 'availability' on this calendar so they need to have the option to click 'available every day' or 'available monday to friday' or be able to individually choose what days they are available etc.
This data needs to be sent to a separate table to be pulled into a separate function that is already being built but should demonstrate on the calendar by days going green or red (just an example).
It's not that complicated at this stage but there could be another project in the future on integrating some other parts but that is further down the line.
I am a developer myself so can demonstrate everything in a simple way for you to follow and I can send through a full brief on this.
Note: This project is currently being embedded into wordpress as this is being used for the user and login functionality