<!-- Need help? Refer to the design review meeting guidelines: https://github.com/ethereum-optimism/design-docs --> **Title of Meeting** <!-- One sentence overview of the meeting --> Adding the return to the RelayedMessage event. **Date, Time and Duration** <!-- Consider using https://www.worldtimebuddy.com/ to help schedule Meetings default to 30 minutes, please ask for more if necessary --> Deferring to admin for scheduling **Link to design doc** <!-- Include a link to the PR for the design doc or other links to be discussed --> https://github.com/ethereum-optimism/design-docs/pull/227 **Additional Context** <!-- Any additional information that the attendees should know ahead of time? --> WIP Promise-like callbacks dependent on this: https://github.com/ethereum-optimism/design-docs/pull/216 **Requested Attendees** <!-- Who should attend the meeting? --> Wonderland, Mark, Harry
