Possible Clues:

• ___ Vegas (Note letters 3-1 of this answer + letters 3-2 of 4-Down)
• — Cruces
• "Deck the Halls" syllables
• "Viva — Vegas"
• ___ Palmas, Canary Islands
• ___ Palmas, Spain
• Vegas opening?
• Vegas airport code
• Part of U.N.L.V
• Vegas intro