Implement a predictive scaling policy for the EC2 instances. Deploy the database on an Amazon Aurora PostgreSQL Serverless v2 Multi-AZ DB instance with auto-scaling read replicas. Develop an AWS Step Functions state machine to execute parallel AWS Lambda functions for pre-warming the database prior to a sale event. Establish an Amazon EventBridge rule to trigger the state machine.

Adopt a scheduled scaling policy for the EC2 instances. Utilize an Amazon RDS for PostgreSQL Multi-AZ DB instance with auto-scaling read replicas for the database. Set up an Amazon EventBridge rule to invoke an AWS Lambda function for creating a larger read replica before a sale event, and failover to this replica. Configure another EventBridge rule to invoke a Lambda function to scale down the read replica post-event.

Apply a predictive scaling policy for the EC2 instances. Host the database on an Amazon RDS for PostgreSQL Multi-AZ DB instance with auto-scaling read replicas. Construct an AWS Step Functions state machine to run parallel AWS Lambda functions for pre-warming the database before a sale event. Implement an Amazon EventBridge rule to activate the state machine.

Employ a scheduled scaling policy for the EC2 instances. Manage the database on an Amazon Aurora PostgreSQL Multi-AZ DB cluster. Set up an Amazon EventBridge rule to trigger an AWS Lambda function for creating a larger Aurora Replica before a sale event, and failover to this replica. Establish another EventBridge rule to invoke a Lambda function to scale down the Aurora Replica after the event.