The short answer is no.
Your Events videos are kept on the cloud for 7 days (30 days for Premium users) before they are automatically or manually deleted. Once a video is deleted, there is no way of bringing it back.
In order to protect our user's privacy, we have no access to your data.
If you want to save your Event videos, follow this guide on downloading videos to your Moments.
Still have questions? Let us know on the feedback form