WordPress lets you set a number of days after which comments will be unavailable for individual posts. This plugin will allow you to keep commenting open on specific posts.
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README.md
override-comment-deadline.php
readme.txt

README.md

Override Comment Deadline

Notice: The stable version of this plugin should always be downloaded from the WordPress Plugin Directory.

Allows you to enable comments on posts which are older than the comment deadline set in discussion settings.

Use

  • Set a comment deadline in Settings > Discussion using the "Automatically Close Comments..." option. Closing comments on old posts is a great way to avoid spam comments.
  • Edit an individual post on which you'd like to keep discussion open indefinitely and check the Override Comment Deadline box.