I had not intended to go into this much detail but, you know, it's done and it's not as long as all that. Besides, players of Gawaine, Gaheris, Pellinore, Tor, and Balin will be plenty happy for that detail.
The last year of the chronology for the core AL! release is 413 AD. It covers the final battles with Ryons and Lot, the marriage of Arthur, and the Quest of the White Hart.