Lucent Wish

You need to find and send a song and a picture on a summer theme, or what?

It doesn't have to be a specifically "summer song"; it's more about the sender's personal associations.
And yes, a picture is needed, but again, it doesn't necessarily have to be beaches or nature.

The second contest is the same masquerade. Participants send an image with a character and a word; others will have to connect them with the names in the first post via private message.

And in what form and where should I send all the content? Did I understand correctly that I can send everything at once?

Yes.