Wiktionary
get into the act
vb. To participate in an activity, especially a successful or attractive one.
Usage examples of "get into the act".
We would run a cog railway up the valley to that flat spot there, then sink an angle shaft parallel to the face of the deposit Then Dengo would get into the act and decide where the workers would live, where the school would be built for their children, where the playing field would be.
Out of the corner of my eye I saw Angelina plant an elbow in Flavia's rib to encourage her to get into the act as well.
They looked at each other, his dangling eye trying to get into the act, too.
We call him Sam, and he's a nuisance, because he's always trying to get into the act.