Drawing text above entities

What event should I use if I want to draw text above entities after they are rendered? Note that I do not mean living entities, so RenderLivingEvent will not work here.

I know how to draw the text, and I can get it to work with living entities using RenderLivingEvent but that leaves out the other types of entities.

For example, if I wanted to draw a string above an item entity labeling how many items are in that dropped stack, or a timer above lit TNT displaying how much time until it explodes.

Thanks.