The wedding at Whitewalls

What looks like a tourney for a dragon's egg is in fact the seed of a second Blackfyre rising, and Dunk and Egg walk into the middle of it. The plot is unpicked before it can bloom, largely by the man nobody sees doing it ÔÇö but it is a near thing, and it teaches Egg exactly how a realm is lost.

The fuller tale

Lord Butterwell's wedding at Whitewalls was advertised as a tourney with a dragon's egg for a prize, which was already strange ÔÇö dragon's eggs had been stone for sixty years and nobody was giving them away. What it actually was: a gathering of everyone in the realm who had been on the losing side at the Redgrass Field, under one roof, being counted.

The second Blackfyre rebellion was assembled at that wedding, around a pretender the guests were told was Daemon Blackfyre's son. Dunk and Egg walked into it by accident, as they walked into everything, and spent the tourney working out that half the men drinking around them had a black dragon sewn inside their cloaks.

It came apart before it began. Bloodraven had known about it from the start ÔÇö he had a man inside from the first day ÔÇö and the loyal host arrived at the gates while the plotters were still congratulating each other. There was no battle. There were fines, hostages, a few heads, and a castle pulled down stone by stone so that nothing would stand there again.

What Egg learned

A boy who would one day be king watched a rebellion get built out of resentment, flattery and one convincing lie, and then watched it fail because one man had spent twenty years listening. Both halves of that lesson stayed with him.

It is also the clearest look this chronicle gets at Bloodraven at work: no army, no dragon, no law worth the name, just a network of people who owed him and the patience to let a conspiracy assemble itself where he could see all of it at once.

Elsewhere in the wiki

 See the world as it stood in 212 AC 

What became of it ÔÇö if an ending is written, it is here. Spoilers.

The chronicle records no ending here ÔÇö or none the maesters have set down.