I like Holy, Holy, Holy, but it is a poor substitute for For All The Saints.
Another great gospel song by John Dykes, composer of the music for "Holy, Holy, Holy," that would be appropriate for All Saints Day is "Ten Thousand Times Ten Thousand" (1875).
Ten thousand times ten thousand in sparkling raiment bright,
The armies of the ransomed saints throng up the steeps of light;
’Tis finished, all is finished, their fight with death and sin;
Fling open wide the golden gates, and let the victors in.