Learn Portuguese (Portugal): Espero que nós brindemos juntos no casamento.

The phrase Espero que (I hope that) expresses a wish or desire. In Portuguese, expressing hopes and wishes triggers the Present Subjunctive (Presente do Conjuntivo) for the following verb, because you are talking about an intention or possibility rather than a guaranteed fact.

How is the subjunctive form brindemos made from the verb brindar?

To form the Present Subjunctive for regular -ar verbs like brindar (to toast), you swap the typical -a vowels in the endings for -e vowels. So, the normal present tense nós brindamos (we toast) becomes the subjunctive nós brindemos.

Could I drop the word nós and just say Espero que brindemos juntos?

Yes! Because the ending -emos in brindemos tells us immediately that the subject is nós (we), the pronoun is entirely optional. Including it here just makes the sentence flow a bit better or adds a slight emphasis.

Why is it no casamento instead of just em casamento?

In Portuguese, you almost always need to include the definite article (the) with specific events or places. No is the mandatory contraction of the preposition em (in/at) and the masculine singular article o (the). Literally, it means at the wedding.