concert
US /ˈkɑːn.sɚt/
UK /ˈkɑːn.sɚt/

1.
a musical performance given in public, typically by several performers or of a varied program.
:
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We went to a rock concert last night.
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The orchestra will perform a special concert next month.
2.
agreement or harmony between people or groups.
:
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The two nations acted in concert to address the crisis.
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Their efforts were in perfect concert.
1.
to arrange (something) by mutual agreement; coordinate.
:
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The two departments concerted their efforts to complete the project on time.
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They concerted a plan for the upcoming event.