Allowing viewers to comment on your vaams is a great way to keep the communication direct and in one place. But if you don't want to show comments or dates, you can disable comments and/or hide timestamps for specific vaams.
In your vaam, click the "timeline" on the right.
You'll see an option to "Enable & show comments" or "Disable & hide comments". Enabling comments lets viewers comment and see others' comments. Disabling comments won't let viewers comment or see any comments.
If comments are enabled, you can also hide when they were posted by clicking on "Hide timestamps".
And that's all you need to have full control of the comments in your vaams!