Timed Comment Enabler/Disabler

I’d like to be able enable/disable/enable the ability

to leave comments.

My specific use case is that Im running an auto

webinar where Im going ask attendee’s to say

hello and in the comment area during the 1st

10 minutes of the presentation.

Then close commenting (but want to continue

to show the comments previously left)… then

reopen comments for questions.

Any recommendations on how to do this?

PS: Is there a way to place a “comment box

shortcode” in the body of the WP post and

would override the the checkbox “allow