逢场作戏

féng chǎng zuò xì

lit. find a stage, put on a comedy (idiom); to join in the fun

to play along according to local conditions

逢

féng

to meet by chance

场

chǎng

large place used for a specific purpose

作

zuò

to do; to engage in

戏

xì

variant of 戲|戏[xi4]