Ron wrote:

You can patch with plaster, but if some came down now, the rest is probably
not far behind. I'd take it down and drywall it. Patching procedures vary
depending on the hole size. How big are they?

Each one no more than four or five square inches.

Ron

Holes in plaster usually don't appear without lath pulling loose. Is
the lath sagging? If so, bracing it and screwing it back in place
should help. Pretty easy to patch little holes after that.