Not sure, I am on the last month and I had access on September for sure.
I think you should work with Randle (green haired guy from the guild) and progress the story with him, you can find him at his house in the market of the capital city (North East).
Wyverns I am stuck with port city one and Desert, how do you get access to northern desert anyway? The 2 soldiers won't let me pass ...
As for the bandit hideout, Leela figures out it has to do with illusion magic at some point, and you need some grass from the forest north of the village of Johan and Leela.Talk with the people in the village maybe to unlock the hint.
The Desert one and the port city one, you have to visit them on "Earth Day" and "Sprout Day" respectively. You will find the Red Wyvern in the usual Desert, no need to go further North and as for the Blue Wyvern, you will find them at the Beach of the port city.
Is it even possible to win in the Cassino at Mahjong? If yes - how? I always lose.
Also my game stopped after I come back to the village after paying the debt. In the moment where I meet my fiance (after showing exclamation marks), nothing is happening and enter key (and any other) do not work. Animations of walking chickens and characters is working. So it's not a crash, but dialogue scene did not started.
Noticed someone asked about the Lewd fish. Has anyone worked out where it is. I suspect its the Secret Spot mentioned by the former pirate but only get different amounts of money for 3 days effort.