Did I Miss All the Chapter 3 Side Quests?

So I entered Loc Muinne with Iorveth, and my quest directive basically said to find Phillipa, so I did that immediately. My assumption was that the city was hostile to me and I needed to more or less sneak around.

I am having trouble with the golem in the Spellbreaker quest, and because of this have looked at some walkthrough help sites. I couldn't help but notice some text that implied that I am on the path to the final battle.

Can I still do side quests after the Spellbreaker quest, or am I locked on a path to the end game?

Solution 1:

Yes you can,however it will be your last chance do do so. After you complete "Spellbreaker" quest you will unlock "A summit of mages" quest and once you start "A summit of mages" your remaining quests will be failed.

Walkthrough(source)