You've found them all.

The Forgotten Realms was first published for AD&D 1st edition. When 2nd edition came out, the change in spells and available classes was explained through the Godswar aka **The Time of Troubles**.

The introduction of D&D 3e was exceptional in that there was no event introduced to explain the rules changes.

The **Spellplague** (and hundreds of years) explained the shift from D&D 3.x to 4e, and the **Sundering** did the same for the transition to 5e.