Grand opening = official opening of a new business (abertura oficial de um novo negócio)
Many people were invited for the grand opening of the new store.
Muitas pessoas foram convidadas para a abertura da nova loja.
José Roberto A. Igreja is the author and co-author of several ELT books, including:
A BRAND-NEW ELT BOOK!
600 Phrasal Verbs (with Jonathan T. Hogan)
Fluent Business English (with Robert C. Young)
English for Job Interviews (with Robert C. Young)
Fale Inglês como um Americano (with Robert C. Young)
American Idioms! (with Joe Bailey Noble III)