Learn Portuguese (Portugal): Vamos organizar o evento amanhã. - We are going to organize the event tomorrow.

To say what you are going to do, you combine the present tense of the verb ir (to go) with the infinitive (the basic, unchanged form) of the main verb. Here, we use vamos (we are going) and organizar (to organize).

Why isn't the word nós (we) included before vamos?

In Portuguese, the verb itself tells you who is doing the action. Because vamos only ever means 'we go' or 'we are going', adding nós is unnecessary. Native speakers usually drop it unless they want to add special emphasis.

Does the word o mean 'to' in this sentence?

No, here o means 'the'. It is the masculine singular word for 'the', matching the masculine noun evento. In the phrase organizar o evento, we are saying 'to organize the event'.

How does the mark over the 'a' change the word amanhã?

That mark is called a tilde. It tells you two things: first, the sound is nasal (produced partly through your nose), and second, that the final syllable is the stressed one, meaning you emphasize the end of the word.