Hello Aditya, I haven't tried this myself, but theoretically you can harness the power of Amazon s3 events to generate an event whenever there is a CRUD event on your parquet files in S3. First you'd have to generate the event: https://docs.aws.amazon.com/AmazonS3/latest/userguide/NotificationHowTo.html

Then you would want to subscribe to the event use the event info to pull the file into Redshift https://docs.aws.amazon.com/redshift/latest/mgmt/working-with-event-notifications.html#working-with-event-notifications-subscribe

-Scott