What Could It Be??

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Across
  1. 2. Outdoor cooking event
  2. 4. Warmest season of the year
  3. 6. Property or item leased temporarily
  4. 8. Life's memorable moments
  5. 11. Grand Canyon State
  6. 12. Next year on the calendar
  7. 13. Engaging pastimes and pursuits
  8. 15. Close-knit group sharing bonds
Down
  1. 1. Recollections of past events
  2. 3. Live in watercraft
  3. 5. Future cars will all need to ___
  4. 6. Phase of life after ending work
  5. 7. Cold drinks often enjoyed socially
  6. 9. Essential for life
  7. 10. Famous Arizona destination with London Bridge
  8. 12. Passed down customs and practices
  9. 14. Period of leisure and relaxation