Decoding the calendar:  
The trick is the script you own, doesn't correspond in scenes with the traditional one, so look below for when you're needed!!

Act I
Prologue:  Full Cast
Scene 1:  Golde, Yente, Tzeitel, Hodel, Chava, Shprintze, Bielke, Motel
Scene 2:  Tevye, Golde, Mordcha, Mendel, Avram, Nachum, Yussel, Perchik
Scene 3:  Tevye, Golde, Perchik, Tzeitel, Motel, Hodel, Chava, Shprintze, Bielke, (At the end, full Jewish chorus for Sabbath Prayer)
Scene 4:  Lazar Wolf, Tevye, Jewish men, Russians, Fyedka, Sasha
Scene 5:  Lazar Wolf, Constable, Tevye
Scene 6:  Perchik, Shprintze, Bielke, Hodel, Golde, Tevye, Motel, Tzeitel, Chava
Scene 7:  Full cast except Russians
Scene 8:  Jewish Chorus, Motel, Chava, Fyedka, Sasha, Avram, Nachum, Yussel, Mordcha, Rabbi, Mendel
Scene 9:  Jewish Chorus, Tevye, Golde, Perchik, Hodel, Rabbi, Avram, Nachum, Yussel, Mordcha, Mendel
Scene 10:  Full Cast

Act II
Prologue/Scene 1:  Tevye, Perchik, Hodel, Golde
Scene 2:  Jewish Chorus, Yente, Avram, Nachum, Yussel, Mordcha, Mendel, Rabbi
Scene 3:  Hodel, Tevye
Scene 4:  Jewish Chorus, Motel, Tzeitel, Avram, Nachum, Yussel, Mordcha, Mendel, Rabbi
Scene 5:  Jewish Chorus, Tevye, Avram, Nachum, Yussel, Mordcha, Mendel, Rabbi
Scene 6:  Tevye, Golde, Chava
Scene 7:  Yente, Golde, Avram, Nachum, Yussel, Mordcha, Mendel, Constable, Rabbi, Jewish Chorus, Shprintze, Bielke, Tzeitel, Motel
Scene 8:  Yente, Golde, Avram, Nachum, Yussel, Mordcha, Mendel, Constable, Rabbi, Jewish Chorus, Shprintze, Bielke, Tzeitel, Motel, Chava, Fyedka