Hakunin dreams

The Hakunin dreams are a series of four cutscenes appearing in Fallout 2, urging the player to find the GECK.

Overview
Arroyo's shaman, Hakunin, appears to the Chosen One in their dreams, informing them of the degenerating conditions inside the village and asking them to hurry.

The four dream sequences are scripted to occur on October 23, 2241, January 21, 2242, April 21, 2242, and finally, July 20, 2242. If the player locates the GECK in Vault 13, the game immediately plays the last dream sequence, skipping any remaining dreams. Furthermore, Arroyo is destroyed, with only Hakunin remaining behind to tell the Chosen One of the fate that has befallen their tribesmen (and point them toward Navarro).

July 20, 2242
Alternatively, it plays the moment the player exits Vault 13 with the GECK.