Possible Clues:

• A public holiday in Barcelona
• Piñata-hitting occasion
• Kind of ware
• Fast that is replaced by festival
• Betrothed, half-cut, is in France entering carnival
• Feast I set out for a religious festival
• Carnival that is fast getting out of hand all round
• Celebration in 18-Across
• Carnival or festival especially in Spanish-speaking countries
• Continental knees-up