This is the 13790th most frequent Russian word.
новосибирцам
"Novosibirtsam" means "to the people of Novosibirsk" or "Novosibirsk residents" (dative plural form).
In this sentence, 'новосибирцам' is the dative plural form of 'новосибирец', meaning 'to the people of Novosibirsk', indicating that they are the indirect recipients of appreciation.
Новосибирцам понравилось новое открытие музея.
The people of Novosibirsk liked the new museum opening.
Here, 'новосибирцам' is in the dative plural, showing that 'the people of Novosibirsk' are the indirect object receiving the invitations.
Мы отправили новосибирцам приглашения на выставку.
We sent invitations to the people of Novosibirsk for the exhibition.
The word 'новосибирцам' is used in the dative plural case, indicating 'to the people of Novosibirsk', in possessive and contextual relation to the city's history.