It's okay to have a total of three with the okashiratsuki and dried foods.
It's usually to make the number odd, so preparing 1 or 3 is common.
In case of fruits, is it okay to choose something like 3 apples, 1 bunch of grape, and 3 pears?
Yes, or it's okay to choose in odd numbers such as 5 apples.
But for the bounty of the field, you choose both foods made on the ground and under the ground.
For example, 3 eggplants, 1 white radish, and 3 sweet potatoes.
Is that okay to offer such as tomatoes other than eggplants or carrots instead of radishes?
Of course it's no problem to offer substituted vegetables, it's okay to offer Japanese taro potatoes or normal potatoes.
In case of vegetables and fruits, it's better to choose an assortment of foods in season.
I see, so the point is you choose an odd number of foods in season.
Thank you very much, I understand about the offerings in the Jichinsai.
Do you wear formal clothes when attending the Jichinsai?
There's no particular rule to that says you must dress up.
But isn't it better to wear a suit?
It's okay to wear casual clothes such as a T-shirt and pants in case of a personal house.
Of course it's not good to wear Japanese clogs, Japanese sandals, or Western sandals.
If you consider the purpose of the Jichinsai, you'd know it's not good to wear clothes that are too casual.
Because it's to give thanks to the gods and pray for the safety of the construction and for the house to thrive.