I would recommend this:
1. Create a custom calendar that only has Tuesdays as working days
2. Create a 1 day task in the schedule called "Go Live Start" or something and set it's Task Calendar to the calendar you created. Make it's predecessor the Go/No Go Meeting. **Do not load resource assignments onto this task** , it's strictly being created to achieve the mechanics of what you want to happen in the schedule. I would say just make this a milestone but milestones don't honor the task calendar set so you have to give it some duration.
3. Tie your actual discrete Go Live tasks Start-To-Start with the "Go Live Start" task.
Now no matter where your Go/No Go Meeting is moved to, your Go Live work will always begin on the following Tuesday.
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