12. At 7.30 he was scheduled to dance to the electronica version of "Cotton-Eyed Joe" with The Dancing Usher Guy, while he wore three bright green stems of licorice plant that stuck out from the airholes in his River Cats ball cap.

Ans: 12. At 7:30 he was scheduled to dance to the electronica version of "Cotton-Eyed Joe" with The Dancing Usher Guy, while he wore three bright green stems of licorice plant that stuck out from the airholes in his River Cats ball cap.

1) Numerical time expressions take a colon, not a period.

2) "while" is a subordinating conjunction; therefore, it signals a dependent clause. A dependent clause after the mainclause is not set off with a comma.