I'd say at 8 pm, but it ain't 8 yet in the UK ... 20 minutes to wait at least!
And yes, with regards to versatility and choice, the Dutch vaults do not need to hide. Ol' Queen Mary would have had a field day raiding them.
And Max knows how to play along with the gems, she does mix and match much more than Queen B used to, and has, imho, already worn much more different pieces than her MIL during her long reign (Max has unearthed quite some pieces which were last seen on Juliana).
So either Max will look fab tonight (like the day of Wax inthronisation), or she'll look like an Xmas tree in a hot mess of a gown. Hoping for the first,