Crossword puzzle clue "annual observance celebrating commitment to the planet"

Here are the possible solutions for annual observance celebrating commitment to the planet clue

Answer
Clue
Relevancy
earthhour
Clue
Annual observance celebrating commitment to the planet
proximab
Clue
Newfound planet similar in mass to Earth (from National Geographic's "6 Science Discoveries Worth Celebrating in 2016")
dst
Clue
Annual 34-wk. observance
guyfawkesday
Clue
Annual London observance
lei
Clue
___ Day (annual Hawaiian observance)
Definition
a garland of flowers
piday
Clue
Annual math-related observance celebrated, appropriately, on 3/14: 2 wds.
unday
Clue
Annual Oct. 24 observance
unitednationsday
Clue
Annual October 24 observance related to this puzzle's theme

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