Completion of my English course

My plan to celebrate the successful completion of my English course is meet my friends in a restaurants to eat pizzas, because I love pizzas and always is good be together with loved people.
MENSAGEM PATROCINADA Aprenda dicas sobre os tempos verbais em inglês! Baixe agora o seu Guia Grátis de Tempos Verbais em Inglês. Ele contém um ótimo resumo para revisar todos os conceitos.

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Eu troquei "meet" por "meeting". Adicionei uma pequena virgula. Alterei o verbo "be" para "to stay".

My plan to celebrate the successful completion of my English course is meeting my friends in restaurants to eat pizzas, because I love pizzas, and it is always good to stay together with loved people.
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I would also redo the following bit "...is meeting my friends in a restaurant to eat pizzas."
Unless your class is so big that it has to be split to two or more restaurants.