Tell about one of the ethnic groups in Vietnamese

tell about one of the ethnic groups in vn:
-Iwould like to tell about the ...........
-They have a population of ......
-They live in......
-The languge they speak belongs to............
-They mainly live on.........
-They hold .... festivals every year sich as ...................

giải dùm mình nha!
cảm ơn trước .