A few bonus encounters during the festival (our group had an enchantment-focused Sorcerer with Sleep, so it required a bit more challenge to stay interesting and to seem a legitimate threat).
I added a pair of goblins on a rooftop with shortbows (partial cover, but they had lit the building on fire so after 1d4+1 rounds the ceiling collapsed, and they along with it).
Two groups of four goblins each - one with a Warchanter - trying to burn down the Goblinsquash stables. Hosk is there trying to get the horses out but is menaced by one group while the others fan the flames.
A pair of goblins menacing Shayliss in an alleyway while the PC's are on their way to the north gate. This allows her to be rescued and develop her bit of hero worship naturally, but then I had a much bigger subplot with Aldern and Shayliss so thrusting them together at the time was expedient.
I've made some extensive changes to the first two chapters of RotRL. One of the more minor ones was that the Sheriff wanted everyone to stay in town (including visitors from the festival) until they could make sure the area was clear of goblin marauders... bought a couple of extra days for the 'slow down' and gave the PC's a reason to stay in town (if needed, the Sheriff could ask them to stay as a reassuring presence to the townsfolk while his men checked out the surrounding region).