If you wish to remove a meeting from your survey, you can do this by clicking the ... ellipsis button on the far-right of the meeting and choosing Archive Event.
A meeting that has been archived can be un-archived, or restored, by navigating to the survey Settings tab. From here, click Restore Archived Content and then choose Meetings.
Please note: this will un-archive all archived meetings related to the survey, not just the one you're hoping to restore. At this point you will need to archive the undesired meetings manually again.