It was a two day event in 2014 as well, run by the VSCC themselves, not in partnership with the HSCC, although as Bauble says they have combined in the past. I think it's fairly straightforward, if the VSCC run Spring Start for VSCC eligible cars it tends to a be a one day event, when there are invited grids (like this year, 2014 and quite a few other years in the past) then it becomes a two day event.
I imagine that lots of factors including availablity of the circuit, how quickly invited grids confirm, general economics, etc all contribute to the decision.
I suspect the lack of comment on the VSCC forum is because it's not really anything unusual.
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