No summer event means no new level 6 upgrade for 6 months which is too long, but to be fair Halloween and Xmas are close together.
What next?
Pinewood production ( foresters, cutters, sawmill)
Hardwood production ( foresters, cutters, sawmill)
Meat production ( hunter, deer hut, butcher)
Coal ( coking plant, Recycler)
Water (wells, watermills)
Copper Mine, Smelter, Bronze weapon
Storage ( storehouse, improved storehouse)
Schools, Fish farms, Nobles , Floaters
Unlikely upgrades are Bookbinder, barracks, provision house,
I'd be happy with most of those alternatives.