Puzzle people's competition ...or hint to each of the clues to 1818AHavana fan[-----------]-, 2929ADitty played on an acoustic guitar[------------]-, and 49-Across49AJustice League superhero[------------]?
65A
Upcoming Tampa conventioneers
67A
Hirsch of "Milk"
68A
"Welcome to Maui!"
69A
Sleeping soundly
70A
Mr. Clean alternative
71A
Children of Japanese immigrants
72A
Masseur employer
Down
1D
Eminent authority
2D
Stately court dances
3D
Ain't Maine dull?
4D
Fungal spore cases
5D
Chinese exercise system
6D
California coast section that starts near Hearst Castle