Can an Awakening Youth/Adult be on a Great Banquet Team?

No.

You may be asking - What if there is someone who has attended the Awakening as a Youth but is now an adult and they want to be on the team for a Great Banquet?

Even though they have attended a similar weekend as a youth the Great Banquet is designed for adults and contains more in-depth content. To be on the Great Banquet team the youth needs to attend a Great Banquet as a guest first, before they are asked to be on the team for an adult weekend.