Q.weeping cherry tree
We have had a weeping cherry tree in our yard for the past five years, and it has done fine. This year it started to bud, but then we had a couple of nights in the high 20’s and the buds turned black and it appears to have died. Is there anything we can do to bring it back to life?

If the buds were touched by frost and died off, you will not get flowers.
Give the tree time to recover and it should leaf out.
https://www.gardeningknowhow.com/ornamental/trees/weeping-cherry/weeping-cherry-growing-tips.htm
https://www.gardeningknowhow.com/ornamental/trees/weeping-cherry/pruning-weeping-cherry.htm