Perhaps you could come up with several character types (one for each girl)... a rich widow, a musical prodigy, an eccentric scientist, etcetera. Then you could assign each girl a character in secret, letting them draw which one they are from a hat or something. They each have to act out their character in a scene, like a dinner party or something, each staying in character and giving subtle clues about what their character is through natural conversation. After a certain amount of time, everyone gets to guess what character the others were. It could be fun and good practice for drama class.
To change it up a little, you could make one pile of paper slips with one characterization on it, then another with a different character description, then another. Each girl draws a slip from each pile and must create a character to match. Such as poor, college student, birdwatcher. Or flamboyant, airline pilot, gardener. Or shy, waitress, artist. You could also come up with a variety of plot scenarios to keep the acting session moving, also perhaps drawn from a hat. The college student, pilot and waitress for example, could be staying together at a vacation destination (choose a random one from hat) when something surprising happens (draw a plot point). You get the idea.
The easiest game I can think of that's drama related is sorta like charades. Divide into two even number teams if possible.Write some improv ideas on pieces of paper, not the participants but perhaps yourself or others could do them.. Put each teams pieces in seperate receptical, ie paper bag, hat etc. Team one draws from Team 2's holder and visa versa. When Team One is up acting out whats on a slip, team 2 guesses and vice versa.
Another thing you could try is collect a lot of costume articles. Taking turns. each is blind folded and they try to dress in a full costume ie tops and bottoms, shoes, hats and wigs if available. Have a camera because the results will be hilarious.
You could try pin the mouth on the drama mask. Make a smile or a frown mouth and a drama mask. Blindfolded people try to stick it in the right place. The masks of Drama are Tragedy(sad eyes and frown) and Comedy (laughing eyes and smile) Google them in a graphic file to see what I mean
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