In many Harvest Moon games, you can expect to receive suitors bearing Gifts on Spring or Winter Harmony Day only if you have raised the Heart Levels of one or more Eligible Girls or Bachelors to a specific level. This is not the case in Grand Bazaar.
If your Character is a Girl, every Bachelor should visit bearing Cookies on 14 Spring even in the first Year. If your Character is a Boy, you should give Chocolate Cookies or Chocolate Cake to every Eligible Girl on 14 Spring and experience visits from them on 14 Winter, which is the Winter Harmony Day.
From the Courtship and Marriage Guide:
Spring Harmony Day
Although the Flower Festival is an opportunity to raise every one's Heart Levels, including Eligible Girls and Bachelors, Spring Harmony Day is the first Romantic Festival. If your Character is a Boy, you should give Chocolate Cookies or Chocolate Cake to every Eligible Girl if possible.
In some Harvest Moon games, Chocolate will be recognised as a Harmony Day gift by any Eligible Girl. Even though the description of Harmony Day in the Calendar declares that 'boys give chocolate to girls', only Chocolate Cookies or Chocolate Cake will be recognised as a Harmony Day Gift by any Eligible Girl.
Although Joan's selections usually are random, Chocolate Cookies and Chocolate Cake are sold by Joan on both the Spring and the Winter Harmony Day Festivals.
Spring Harmony Day for Girl Character
If your Character is a Girl, you should receive Cookies from every Bachelor, even in the first Spring when they probably remain at Black Heart Level. At high Levels, I expect the Bachelors give Chocolate Cookies instead. This was the case in Island of Happiness and Sunshine Islands.
The Cookies will be delivered by each Bachelor according to a set schedule as follows:
8.00 a.m.: Visit from Ivan
9.00 a.m. Visit from Dirk
10.00 a.m. Visit from Lloyd
11.00 a.m. Visit from Angelo
Re-enter your Farmhouse at these times to trigger the Visit Event for each of the Bachelors.
Once Amir arrives in Zephyr Town, his visit will be scheduled for noon.
The Events are as follows:
Today is Harmony Day! Will you get a present?
??? Freyja, do you have a minute?
Ivan: Freia, It's Harmony Day today. I brought this gift for you.
He gives me Cookies.
Ivan: Well, I should go. Take care.
At 9.00 a.m., I re-enter the House to experience the next Event:
??? You have a minute, Freia?
Dirk: Freyja, it's Harmony Day. (laughing) So here's a present from me to you!
He gives me Cookies.
Dirk: Well, I gotta go. Take care, Freyja!
Lloyd: Today's Harmony Day. You know that, right? Freyja, this is my gift to you. Goodbye.
??? Freyja, can I speak with you?
Angelo: It's Harmony Day. So I got this gift for you, Freyja.
He gives me cookies.
Angelo: Well, I'm sure that you're busy, Freyja. I'll see you around!
Spring Harmony Day for Boy Character
If your Character is a Boy, you can deliver Chocolate Cookies or Chocolate Cake to the Eligible Girls at any location or time during the day until 7.00 p.m.
When you awaken: Today is Harmony Day! Give a chocolaty treat to that special some one!
Although the items on Joan's menu usually are random, on Harmony Day in the file where my Character was a Boy, her menu featured both Chocolate Cookies and Chocolate Cake.
Chocolate Cookies: 600G
Cookies with chocolate. Irresistible.
When your Character is a Girl, Boys at lower Heart Levels will give Cookies rather than Chocolate Cookies but if your Character is a Boy and you attempt to give any Eligible Girl plain Cookies, she will not recognise them as a proper Harmony Day Gift. As the prompt states: Give a chocolaty treat to that special some one!
Furthermore, Characters who are not eligible for Marriage neither speak of the Festival nor recognise Harmony Day Gifts from you in Grand Bazaar. It is strictly a romantic Festival in this sense.
Their Responses will be as follows:
Sherry: A Harmony Day gift? Thank you! I hope you're looking forward to winter's Harmony Day!
Freya: Oh, for Harmony Day? Thank you, Freyr. You're sweet. (red heart)
Antoinette: Huh. A Harmony Day present? Uh... thanks.
Daisy: Yay! (red heart) A Harmony Day gift! Thank you! You're so sweet!
Once Emiko appears, she will be eligible for a Harmony Day Gift as well.
Winter Harmony Day
If your Character is a Girl, Winter Harmony Day on 14 Winter is the occasion to give Chocolate Cookies or Chocolate Cake to the Eligible Bachelors in the game.
As on Spring Harmony Day, Joan will sell both Chocolate Cookies and Chocolate Cake at the Cafe on this date..