Auto Comment Poster/Expirator/Reposter

Any suggestions on how to accomplish the following…

I am running an autowebinar with specifically timed queues

towards the end of the webinar for “pre-asked” general

questions I’d like to program into the comments area.

Actual live attendee will see these comments appear as if

they are just posted from other attendees (avatar too). I

want the ability to have these comments appear at minutes

29, 31, 35… and then 90 minutes after the event, to have

the comments “disabled” and reset back to appear again

tomorrow at the same time.

Any suggestions will help.