hubieren concurrido
-they/you will have attended
Future perfect subjunctiveellos/ellas/ustedesconjugation ofconcurrir.

concurrir

De las decisiones del Consejo de Ministros son solidariamente responsables el Vicepresidente Ejecutivo y los Ministros que hubieren concurrido, salvo aquellos que hayan hecho contar su voto adverso o negativo.
The Executive Vice-President and the ministers present are jointly responsible for the decisions of the Council of Ministers, except those they voted against.
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celery