Possible Clues:

• Oscar night celebration ... and where to find the ends of the answers to starred clues
• Opportunity for late-night stargazing
• Post-event bash ... or where eight key words in this puzzle might appear
• Function following a formal
• Where to see stars late at night?
• Post-prom event, or where each word in 16-, 28-, 33- and 43-Across can go
• Event that might last until the wee hours
• Celebration following the main event
• Celebration's continuation, and a hint to the ends of the starred answers
• Oscar Night event