Learn Portuguese (Portugal): Amanhã vens cá e trazes a tua sugestão. - Tomorrow you are coming here and bringing your suggestion.

The choice depends on where the speaker is right now. By using vens (you come), the speaker indicates they are currently at the destination and expect the listener to move towards them. If the speaker and listener were both traveling to a different, third location, the speaker would use vais (you go).

Why do we use trazes (from trazer) here rather than levas (from levar)?

Trazer (to bring) is used for transporting an object towards the speaker's current location, which perfectly matches the use of vir in the first half of the sentence. If the listener were taking the suggestion away from the speaker to somewhere else, you would use levar (to take) and say levas.

Could I say vens aqui instead of vens cá?

You will sometimes hear both, but cá is much more natural here. In European Portuguese, cá is strongly preferred over aqui when combined with verbs of motion (like vir). It loosely translates to "over here," whereas aqui is generally used for static locations meaning "right in this exact spot."

The sentence starts with Amanhã (tomorrow), so why are the verbs vens and in the present tense?