I know of three cases now, where parents and close by friends have gathered (“illegally”) to baptize their own babies, and one instance of a wedding minus a priest. The couple give the Sacrament to one another before two witnesses.
I’m sad when I think of all the children who will grow up without any faith and even if having home religion, will not be able to make their first communion or get confirmed.
If I had a child (or any other loved one) who needed to be baptized, and could not get a priest for whatever reason, I'd do it and not give it a moment's hesitation. Take a video, execute a notarized statement, then, when things return to normalcy, submit this as evidence of valid baptism.
As far as weddings, yes, I know canon law allows for it, but still, nobody ever has
to get sacramentally married at any specific time. (If so, please someone explain when and why.) The affianced couple could always just consider that it is the Divine Will for them not to be able to receive the sacrament at this time, and remain chaste and affianced. People who desire a spouse, and cannot find one, go many years, possibly even a lifetime, without being able to get married. What makes affianced couples so special, then, that they have to get married "right here, right now"? (This is assuming no impediments and being otherwise
free to marry.) The only thing I can think of, is if a couple had to get married to ensure some civil or temporal goods, such as insurance, next-of-kin rights, taxation, inheritance, or in the face of an imminent military deployment, but even then, you would need a civil magistrate or official of some sort. In some states, even a notary public can do that. (Note well that I am not
asserting this would be a valid sacramental marriage, nor would it confer any marital rights. This should be clear, but if not, it's worth bringing up.)
Baptism is necessary for salvation, but matrimony isn't.