10k eggs during event

Thats normal , I remember one time I had to go through 60+ eggs just to finally get one and then 5 10kms came in the same week. Just keep hatching.

I only had 2 10Ks for the first 400km that I walked so it's really just chance

What I've found is that eggs tend to come in waves, at least for me they seem to. For instance, lately I've gotten a ton of 5 km eggs after getting a lot of 2 km eggs. This week I've found an additional 3 more 10 km eggs as well after the wave of 5 km eggs. It can take days if not weeks to see a change in eggs, in your case finding some 10 km eggs.

I've gotten two 10K eggs during the event, so it is probably just luck.

Honestly, I feel like I've been getting more...I've had 3 at all times during the event

Droprate of 10km eggs are apparently around 4-5%, so maybe you were just incredibly lucky before the event. My longest period without 10km drop was 80 eggs in a row :S