Maybe Tanabata wasn't Valentine's Day before, but that doesn't prevent it now. Tanabata has myths and legends related to love, which can be used to pin people's longing for love. You said so yourself, didn't you?
Let's talk about the Lantern Festival. You said that in the past, women didn't go out until the Lantern Festival. Who else would do that?
In this fast-paced society, who will pay attention to the historical origin of the festival itself? The previous festivals were colorful and varied, but now the festivals have gradually lost their festive atmosphere.