The Ninth Circuit has found that a woman who suffers chronic memory problems, and whose relatives misread the date of her hearing because of their belief that the first number in a numerical date represents the day of the month (and not the month itself), missed her hearing due to exceptional circumstances.
The full text of Hernandez-Galand v. Garland can be found here:
https://cdn.ca9.uscourts.gov/datastore/opinions/2021/05/12/17-70538.pdf