This document summarizes a webinar about re-engaging mobile app users before and after the holiday season. The webinar featured speakers from Pinterest, Branch, and AppLift discussing strategies for user re-engagement through push notifications, email, and mobile app retargeting. Specific techniques discussed included deep linking users from various marketing channels into apps, using product feed integration with retargeting ads, and designing dynamic and personalized ads targeted to user data and behaviors. The overall message was that retaining and reactivating existing users is important for ongoing app success and driving actions like conversions.