I have a cheap guitar I take if I think it will be at risk. It's more or less OK in use and pluggable if I get asked to go on stage.

When Jacqui and I used to go to Cambridge we had a large chain that went round all the guitar cases with several padlocks and one of the tent roof poles also with padlock so that a thief would have to dismantle or destroy the tent (and so get noticed) or destroy all the guitar cases to get the guitars out and likely damage the guitars so it would not be worthwhile.