I cannot find any way at the moment of adding a Holiday Calendar to the 10.3 version of the mobile apps, nor to subscribe to an internet calendar.
I understand that these are works in progress so this is not a complaint! I am merely checking whether I have misunderstood the interface and thus failed to work out how to do it.
Alternatively I am asking if these will be coming shortly.
I am liking the apps very much so far on both the iPad and Android phone.