Possible Clues:

• Dress up like Spock, say
• Dress up at a comic con
• Fancy dress business spread
• Dress up like a Jedi, e.g
• Doll up like an action figure, maybe
• Comic-Con dress-up
• Comic-Con activity
• Activity at a comic con
• Dress-up at a comic con
• Dressing up as a fictional character with others