In my humble opinion, this song can be about death.
"We'll meet again. Don't know where"
If you think there's some place after death (heaven, or whatever), even if you don't know how to call it, when you die you'll just wait there until you see your loved ones again
"Don't know when"
Because it could take a long time until you reunite.
"We'll meet again some sunny day"
Finally they'll get together and everything will be alright.
"Keep smilin' thru 'til the blue skies drive the dark clouds away"
This would be an exhortation to let go the loss and get over it.
"Please say hello to the folks that i know"
The 'hello', really meaning 'good bye' to all those the dying person cares about.
"They'll be happy to know that when you saw me go I was singing this song"
So that, even at the end, you the person knew everything was gonna be okay, 'cause it wasn't the end.
In my humble opinion, this song can be about death.
"We'll meet again. Don't know where" If you think there's some place after death (heaven, or whatever), even if you don't know how to call it, when you die you'll just wait there until you see your loved ones again
"Don't know when" Because it could take a long time until you reunite.
"We'll meet again some sunny day" Finally they'll get together and everything will be alright.
"Keep smilin' thru 'til the blue skies drive the dark clouds away" This would be an exhortation to let go the loss and get over it.
"Please say hello to the folks that i know" The 'hello', really meaning 'good bye' to all those the dying person cares about.
"They'll be happy to know that when you saw me go I was singing this song" So that, even at the end, you the person knew everything was gonna be okay, 'cause it wasn't the end.
But that's just what I think.