Welcome! This forum has a treasure trove of great info – Scouters helping Scouters! Just a heads up, though - all content, information, and opinions shared on this forum are those of the author, not the BSA.
Our Tiger DL created a calendar in DLE for the scout year, but since then new Cubs have registered that do not show up as invited and do not have an option to invite. The new Cubs show up on the den roster, however.
Similarly, we cannot add the new Cubs to the invite list in SB either. The only thing we seem to be able to do is change venue and dates.
In this case, at least, the system worked perfectly. I was just a little concerned because I wasn’t aware of an expected lag. Had I known I would not have stressed at all!
I wasn’t happy with DLE when I first tried to use it when it came out, but the new DL really likes the comfort and ease of having all the den meeting plans created automatically. They were also happy enough to just move around the order of adventures to fit their planning. The CC and CT really like the free Leader Guide that comes with it too, so I guess it is here to stay!