I also saw the Buxton shows as DD was taking part. All the dancers appeared in the second half :-). As Bluebird says there is an Arabian dance ( 8 girls)- en pointe, Spanish Dance - at Buxton a group of 4 girls, Dance of the Reed Pipes ( 6 girls)- en pointe, Chinese dance - younger girls and boys ( 8 I think) Sweets ( lollipop) again younger girls, Jig dance for the older boys, Russian dance ( older girls who weren't en pointe ) and a lovely dance of the Sugar flowers - again older girls majority en pointe . 4 Sugar plum attendants featured in this - (older more advanced dancers) There are also some fab solos and pas de deux from the Principals. The snowflakes also were on at the start of act 2 but their main dance is in the first act . There weren't any Harlequins :-) I suspect the numbers and age groups can vary depending on the cast .
Hope this helps :-)