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All answers having "Gala" as clue:

4 Character Answers:

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BALL

BASH

FEST

FETE



5 Character Answers:

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EVENT

PARTY



6 Character Answers:

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AFFAIR

FESTAL

FIESTA



7 Character Answers:

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BENEFIT

FESTIVE

PAGEANT

SHINDIG



8 Character Answers:

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FESTIVAL