Explanation:

- The sentence mentions a "nocturnal revel," which refers to a lively celebration or party held at night.

- Revel means to enjoy oneself in a lively and noisy way, especially with drinking and dancing.

- Option 1: Despair - means complete loss of hope. It doesn't relate to a party or celebration.

- Option 2: Gloom - refers to partial or total darkness or a state of depression. It is not about a lively occasion.

- Option 3: Gala - refers to a festive occasion or a celebration. This relates closely to a revel, indicating a party-like atmosphere.

- Option 4: Staid - means serious, reserved, or unadventurous. It's the opposite of a lively celebration.

Based on these definitions, Option 3: Gala is closest in meaning to "revel."