viniésemos
Viniésemos is a Spanish verb form. It is the first-person plural imperfect subjunctive of the verb venir, which means "to come." The imperfect subjunctive is used to express a wide range of moods and tenses, including hypothetical situations, wishes, doubts, emotions, and events that were ongoing or repeated in the past.
In practice, viniésemos would appear in sentences like "Si viniésemos pronto, hubiéramos podido ver el espectáculo"