Order before it's available

• Event for select customers
• Chance to get good seats, say
• Select buyers' event
• Special customer event
• Event for special customers
• Exclusive event before public availability
• Early chance to buy discounted goods
• Advance markdown
• Early deal

Wiktionary Word definitions in Wiktionary
n. 1 The sale of something privately, before it is available to the public 2 The sale of a property before it is built