Related Clues:

• No one here sane
• Everyone present and alert
• Sane - none missing?
• Having one's wits about one (informal)
• Completely sane
• Total number of people attending? That's normal
• No one here fully sane?
• The gate? Not twenty-three
• Nothing here with marbles?
• Sound, in parting with silver
• Everybody has arrived completely sane
• Alert, but nothing missing
• Everybody present is of normal intelligence
• Everybody attending the event is sensible
• Everyone present is rational