I am not sure what it is for but what i do know is that we are missing the possible comments people can make. Of course there infinite types of comments but, this way we are missing the background info which is needed to make a design work.
Why don't you get a piece of paper make some fake dates, names and possible comments slice them up and rearrange them on a new piece of paper. the moment it looks nice to you your done ;-) That's how I normally do it, same is for rearranging someone's living room or arranging a future town. If you found out after all that the comments screw up your design, keep it simple, and add an extra small column per person with an small thumbnail indicating someone has a comment and maybe even a colour range for urgency. (I would do that btw) looks much cleaner
hope this helps
ciao!!