| 100% | LABOR | 5 | ___ Day (September observance) |
| 100% | LABOR | 5 | ___ Day (early September observance) |
| 78% | MLK | 3 | ___ Day (Jan. observance) |
| 77% | LABOR | 5 | Subject of a September observance |
| 76% | HATH | 4 | "Thirty days ___ September . . ." |
| 76% | HATH | 4 | "Thirty days ___ September ..." |
| 76% | HATH | 4 | "30 days ___ September ..." |
| 76% | HATH | 4 | "Thirty days __ September ... " |
| 74% | SABBATH | 7 | Day of religious observance |
| 72% | ARBOR | 5 | ___ Day (tree-planting observance) |
| 72% | ARBOR | 5 | ___ Day (spring observance) |
| 72% | MOTHERS | 7 | ___ Day (May observance) |
| 70% | LABOR | 5 | ___ Day (first Monday in September) |
| 68% | TRANS | 5 | ___ Day of Visibility (March 31 observance) |
| 68% | LABOR | 5 | ___ Day (the first Monday in September) |
| 67% | LABOR | 5 | Day celebrated on the first Monday of September |
| 66% | DECLAW | 6 | ___ Awareness Day (anti-cat-cruelty observance) |
| 66% | MNEMONIC | 8 | "Thirty days hath September ...," e.g. |
| 64% | DECLAW | 6 | ___ Awareness Day (Mar. 29 cat advocacy observance) |
| 64% | OREO | 4 | National ___ Cookie Day (fun March 6 observance) |
| 62% | ENDS | 4 | "Wake Me Up When September ___" (Green Day tearjerker) |
| 62% | PIRATE | 6 | Talk Like a __ Day falls on 19 September |
| 62% | WAKE | 4 | "___ Me Up When September Ends" (Green Day song) |
| 61% | TALKLIKEAPIRATE | 15 | ___ Day (September 19) |
| 61% | PANDA | 5 | National ___ Day (March 16 observance, appropriate to this puzzle) |
| 61% | ENDS | 4 | "Wake Me Up When September ___" (Green Day tear-jerker) |
| 61% | ENDS | 4 | "Wake Me Up When September ___" (Green Day hit song) |
| 59% | CHANUKAH | 8 | Eight-day observance |
| 59% | LABOR | 5 | ___ Day (September federal holiday) |
| 57% | LABOR | 5 | ___ Day (September holiday celebrating workers) |