Reference

The withdrawal of "The Brothers & the Sisters" from the Eurovision Song Contest in 1980 was due to the fact that the contest date coincided with Israel's national Day of Remembrance. This was a significant issue because the group was meant to represent Israel, and their participation was not feasible on such an important day of observance for the country. Consequently, Israel decided not to take part in the competition that year.

For additional context, Israel had also declined to host the contest that year due to financial reasons after hosting it the previous year source.