The Goddess Festival is on Spring 8 but it will not be available in the first season in the game. In order to activate the festival, you will need Nathan and Alisa on the island. Visit the Church during the Winter season between 3:00 pm and 6:00 pm. You also need to unlock all of the other Main characters except for your child and the Mineral Town visitors.
Inside the Church you'll find several villagers talking about putting on a festival for the Goddess. You only have to trigger this event once. The Goddess Festival will involve dancing and food.
In order to fully participate in the Goddess Festival, you will need to invite someone to go with you on the 7th of Spring. Walk around to any of the marriage candidates with a Green or higher heart color (except for Shea and Witch) and invite them to go to the festival with you.
The next morning the person will arrive at your front door. It seems that the preparations are not ready yet for the festival, so he/she would like to hang out in your house until you have finished with your farm work for the day. You are free to leave your house to take care of your crops and livestock.
If you get to working on your farm like a good farmer should, make sure you return to your house before 6:00 pm! If you leave your date waiting for you all day then you will take about a full color (10,000 FP) negative hit to the person's heart color!
When you have finished with your work, go back into your house and talk to your date to go to the festival. At the Meadow, talk with Alisa to start the party. The bachelorettes in attendance will do a little dance to celebrate the Harvest Goddess' birthday.
If you can't get a date:
You can still attend the festival by visiting the Meadow between 10:00 am and 6:00 pm. A shorter celebration dance routine occurs, and it is not as romantic compared to actually bringing a date with you.
To activate the Goddess Festival, you need to have Nathan and Alisa unlocked. Visit the church during the winter season and you'll view a scene where Alisa gets an idea to celebrate the Goddess' birthday with a festival.
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Behind Shea and Wada's house is a mysterious tower. Access to the building is restricted by a statue blocking the doorway inside of their house. To permanently remove the statue, give Wada gifts until he reaches at least 7 hearts. You also need to be in your 3rd year of the game.
Once you have met the requirements, go into Wada's house to unlock the event. Wada will declare friendship with you and lets you access to their sacred tower.
The blue Harvest Sprite, Manfred, will move to the base of the tower after you gain access to it. Every day he will reward you with a food item. It could be just a basic crop, recipe ingredient, or even a fully cooked dish. The item he gives is random, and you can always save your game before talking to the sprite and then simply reload to try again if you don't like the item he gives you.
The advantage to unlocking the tower, besides free food, is you can acquire crops that you might not have unlocked at Chen's store yet. For example, you have to ship 100 pieces of Wheat in order to unlock Cabbage seeds. If you are lucky enough to receive a Cabbage from Manfred, and you have the Seed Maker, you can convert your little Cabbage into a bag of seeds for planting, without the need to ship all that Wheat.
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If you don't like the name "Sunny Island", you can change the name by befriending the Harvest Goddess. Raise her friendship to 10 hearts (60,000 FP), have all of the main villagers, bachelors, and bachelorettes unlocked, and have your Farm Degree at "Ranch Duke" or higher. On a sunny or clear weather day, toss a gift into her pond to activate the rename event.
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