If you haven’t seen it, there are some resources on the getting started page.
That sounds a bit like the “tea party guests” event at the USA Memory Championship. I’m not sure if there will be any tips that might help you, but there are some discussions about the event here:
- US Memory Championship Tea Party
- Tea party methods
- Tea party event
- Videos of the Final Rounds at the 2014 USA Memory Championship
There’s also an old training script that gives a general idea of how the event works.
Is there information about the test online, or do you remember the exact data that you have to memorize for each person?