This is the 12197th most frequent Spanish word.
invitaron
"They invited."
The word 'invitaron' is the third person plural preterite form of the verb 'invitar', meaning 'to invite'. This indicates that multiple unnamed subjects ('they') extended an invitation to the speaker in the past.
Me invitaron a una fiesta el sábado.
They invited me to a party on Saturday.
Here, 'invitaron' specifies the action performed by 'los organizadores del evento', who invited 'all the neighbors'. This usage emphasizes specifying the subject of the verb.
Los organizadores del evento invitaron a todos los vecinos.
The organizers of the event invited all the neighbors.
In this case, 'invitaron' is used with a specific subject ('mis amigos') and indicates extending an informal invitation.