Dec. 24 and 31, e.g.

• Final dates for holiday planning
• Tense times, maybe
• Times to revel, maybe
• Nights just before
• Dec. 24, Dec. 31, etc.
• Party times for many
• Namesakes ever since Eden
• Preceding times
• Impending times

Wiktionary Word definitions in Wiktionary
n. (plural of eve English)