As per my image, I want to plot events up in the grid on the top.

What do you want to see in the boxes? A checkmark to know that timeslot is busy?

Do you have any narrative or other specification? Where do the hours get captured from?

Thank you for replies.
I should have provided more details.
This is essentially a fleet tracking database.  It tracks when the vehicle is delayed and why.  Pressing "Update Status" would 1. Close out previous event with current time and date and 2. immediately open a new event for same vehicle with current date/time as start time.  It shows me how many hours each event has been open for.
The idea for the grid was to visually represent each event and it's duration in hours.  Since it would need to be broken up into 24h fields, then hours would have to be rounded up or rounded down.  (I assume it would be hard to make it without rounding).  Perhaps it would be better to make 48 fields to represent 0.5 hour increments or even better 96 fields to represent 0.25 hour increments.
Is there an easy way of building something like this?