how does we know if they are celebrating qixi festival?

Nowadays, there seems no traditional activities for Chinese people to celebrate the festival. On that day, the young couples and lovers usually exchange presents to show their affections. But how to recognize they are celebrating? Maybe through much more roses on the streets and crows in cinemas for love movies. The most important point is that it falls in the Seventh of July in lunar calendar each other.
This is just my personal thought.