These inside seem to know it is time. I read that they have to have a side shoot before they bloom. This is one of the few without a second shoot. Maybe cuttings are different.
These and Epiphyllums will summer under shade outside.
Easter Cactus has a few buds but I don't think they'll open for Easter. Rhipsalidopsis species is a natural forest cactus, unlike the Schlumbergeras which are tropical forest cacti. The primary difference between the various 'Easter, Christmas, and Thanksgiving' cactuses is their time of bloom. The leaf shape varies as well.
Ike thinks everything in the greenhouse belongs to him. He supervised sorting/soaking Cycad seeds.
This is the last bloom on 'Nymph' amaryllis. Amaryllis outside have buds.