Internal Only.
Seller facing FAQ - https://citybeachsoftware.freshdesk.com/a/solutions/articles/17000141476?portalId=17000029510
Assume they may have read it, if not then send it to them.
Settings that can be enabled
Settings - Administration - Actions
Toggle this on to help with order through-put:

Check any promotions they have setup, check price, products, stock levels, duration. Make a note in the ticket.
Settings - Administration - Advanced.
Check the cron shipment status to help with tracking and shipment updates:
During or after the sale this can be down to 5 mins or maybe less, it is 10 by default.

Let the team know via slack general that seller X is having a sale that is likely to spike orders and be high volume
Have someone else check any settings if needed.