Calendar for a little project. The calendar is dynamically built using JS, using the current day as the reference. Something you can do is to store all the current week's events using an hidden field in you favourite format (eg : JSON). Then when you build your calendar, you can add a specific style (eg : "hover-event") for each day of the current week referenced in event's week list stored in your hidden field. In the same time, you can attach an hover event to ".hover-event" elements to show the corresponding event.