Related Clues:

• Preparatory periods
• Periods before events
• Beer drinkers' utensils
• Corkscrews, essentially
• Those going in first — keys?
• Not marked by levity
• Seasons' first games
• Concerts' warmup acts
• Bar gadgets
• Garage door gadgets
• Cricketers who remove caps?
• Batsmen in first
• Concert starters
• Some operate remotely
• Initial performers