Silver __; Event to Mark a 25-Year Milestone
Puzzle 7 of Time Hard Pack
Question is: Silver __; Event to Mark a 25-Year Milestone
and the answer is: JUBILEE
Word Meaning:
JUBILEE — (countable, Jewish history) A special year of emancipation supposed to be observed every fifty years, when farming was temporarily stopped, certain houses and land which had been sold could be redeemed by the original owners or their relatives, and Hebrew slaves set free.
Definitions from Wiktionary.