The young girls among the villagers honors a dance for the Harvest Goddess herself. If you play as Claire in Harvest Moon: Boy & Girl, you can take part of the dance. The dress is given by Gotz, since his daughter died in a tragedy.
The player can invite a bachelorette to the Spring Goddess Festival by speaking to her the prior day. She will accept if her affection is high enough (purple heart or higher). On the day of the festival, she will be waiting at the player's House. Speak to her, then go to Rose Square. If you don't speak to her at the Farm, she will not show up at the festival and her affection will drop.