A plenary (full) indulgence is granted on August 2nd of each year:
The Portiuncula (little portion) indulgence.
This Thursday, August 2nd:
To obtain the Portiuncula plenary indulgence,
(1) a person must visit a Franciscan sanctuary or one’s parish church on August 2nd with the intention of honoring Our Lady of the Angels, and pray the Our Father, the Apostles’ Creed, and another prayer for the intentions of the Pope;
(2) attend Mass and receive holy Communion, preferably on August 2nd, but at least within 8 days before or after (a longer time is permissible if confession is not available);
(3) receive the Sacrament of Confession within 8 days before or after (a longer time is permissible if confession is not available);
(4) and — for the indulgence to be full — you should be free, at least intentionally, of attachment to venial and mortal sin, and truly repentant.
If you fail to obtain an plenary indulgence due to attachment to some sin, but you perform the other works, the indulgence is partial.
Some commentators say within 20 days before or after, but the norms say “several days”. Since confession and Mass are widely available on weekends, 8 days before and after usually suffices. When confession or Mass is not available, a longer time will certainly still fulfill the conditions.
Apostolic Constitution of Pope Paul VI: Indulgentiarum Doctrina