Can Finish1 and Start1 fields auto update

Pckipling 

Yeah that's the way Project works. Extra fields like Start1, Finish1, etc. are not part of Project's scheduling engine, that is, they cannot be linked into the plan, but, they can be customized with formulas such that they will automatically update based on the formula. For example, you can set Start1 to be x number of calendar days after a task's Start date with the simple formula

Start1=[Start]+x

However, since customized extra fields cannot be linked with other tasks they will have no dynamic relevance.

You could create a separate file for the plan of each dress rehearsal/live event, and you could link those through external predecessors/successors but that will create a linked structure which is more complex and will be prone to corruption. I suggest you create separate summary groups for each event. Link appropriate tasks in one summary group with those in successive summary groups but do NOT link summary lines. For example, let's say you want the first task in the second event to be delayed by 2 calendar months from the finish of the first task in the first event. The predecessor of the second event's first task could be:

1FS+60ed

meaning, start this task 60 elapsed days after the finish of task ID 2. It might look something like this:

Hope this helps.
John