East Lake is now in a Callibaetis hatch fest. This is what we live for and is why I will be guiding there this week! 
Damsels are also getting their summer roll, and fish are looking for adults, but so far the nymphs are better. I discovered a #12-14 Blue Chubby to be a really hot fly when the fish are on the adults. An extended body blue damsel is also recommended. 
Ants and Beetles are good choices along the bank lines too. 
I’ve been fishing a lot of my callibaetis nymphs on a NZ Wool Indicator this week. Partly because of the wind and the drop back bung is too hard to see in the wind. Also, with the Wool, I don’t need to worry about bead size balance and even fished non beaded flies under the NZ Indy this week with outstanding results. I will do the same tomorrow at East!