Possible Clues:

• Ginger hat made specially for party
• See 2
• Crowd sees Georgia boxing
• Deducing from the crowd
• Gleaning, from their being huddled in a group
• Understanding the convention?
• Is this what this group of people would be doing with 17 down? (9)
• For the get-together, see 14 down
• Assembly; a boil
• Understanding - crowd