| Answer | Crossword Clue |
|---|---|
| semicentennial | a 50th anniversary or its celebration |
| semicentennials | SEMICENTENNIAL, a 50th anniversary or its celebration |
| quadringenary | a four-hundredth anniversary or its celebration |
| quadringenaries | QUADRINGENARY, a four-hundredth anniversary or its celebration |
| MATUREBOND | Cause for a 50th anniversary celebration? |
| GOLDENJUBILEE | 50th-anniversary celebration |
