I usually keep everything fully active over Christmas, but this year there will be no mail processed / delivered from 25th-29th December (sounds brief, but a purchase posted on Tuesday, while it'll be collected etc, will not go any further until the following Monday).

So I'm thinking visible with holiday mode on for a few days is the way to go. Plus, I think retail outlets usually get a lot of the post-Christmas custom due to boxing day and new year sales, although I did't really have much of a downturn myself the last two years with a store.