There is a story I once heard about the Ben Ish Chai examining the only known etrog available in Iraq. Despite the great need for it, he declared the etrog passul for use and no one could fulfill the mitzva on Sukkot.
There are many physical mitzvot. Some of them form the main mitzvot of holidays, such as:
- Arba Minim
What does someone do if, for reasons beyond one's control, it is impossible to attain them? Is there any kind of substitutional prayer or other that acknowledges this lack? There must have been communities throughout history, and including today, that dealt with these issues.
I'm familiar with substitutions for less-essential issues (i.e., the Ben Ish Chai Nitzavim 3 recommending washing the hands 40 times if there is no mikva or shower before a chag).
Does anyone know of any customs that address this?