Admin>Concert Details>Seat Plan>Seat Plan Cache
When the seat plan cache has been enabled (the cache creates a memory of the seat plan pages for faster rendering to the visitors browser.)
If you are editing products, prices etc you may not see the changes immediately.
In this case then it would be better to clear the seat plan cache:
Admin>Clear Cache will do that for you.
Clear cache will empty the cached pages in the /cache/ directory