Sorry, I cannot assure that daffodils and alliums will not be harmed by cold that will arrive sooner or later in this so far very mild winter. Any local gardener who has been around for a few years has seen daffodils popping up in January, and has probably seen an occasional flower with a prolonged spell of warm temperatures. I’ve never seen any damage to flowers or foliage, but I have never experienced foliage that is a foot tall in late December. I expect there will not be a problem, but I’ll know when you know, in a few months.
Finally, the weather has turned cooler, so hellebores will slow down and not pass out of bloom so quickly. Several that began flowering a few weeks ago are fading much more quickly than if they began flowering at their more typical time in mid February. Thankfully, a dose of cold should remedy this. There is no advantage to having blooms so early if they fade so quickly.
Hellebores are sturdy and cold tolerant, so I expect no harm will come to the flowers that are just opening, or to buds that are set to open. I do wonder what will become of new leaves that are beginning to open on the early flowering ‘Ogon’ spirea. I suspect that fresh leaves cannot manage through the cold of winter, supposing that there will be cold at some point. Still, the spirea is nearly a weed, and if new growth is killed I expect the shrubs will survive without incident. Probably.