Event Flags

All addresses JP1.0 (Bizhawk formatting, big endian)

1F371A
0x01 Doggy race is complete.  Entering with this set but not 0x02 will crash.  If both are set, you will receive the appropriate reward/message.
0x02 Dog race is occurring.  Enter the area with this set and the race will start.
0x04 ??? Crashes if you enter the area with this set
0x08 through 0x40 seem to encode which dog you've picked during the race and also seem to handle which message you receive after the race
0x80 ???

1F371B
0x20 & 0x40 caught in Deku King's chamber
0x80 disables pause (used for night transitions & area title cards)

1F371C
0x10 pulled out Ocarina for captured monkey -- cannot get Sonata if you set this ahead of time
0x20 is set when you have talked to the monkeys
0x40 is set when you enter Southern Swamp after saving Koume but before talking to the monkeys
0x80 set during day transitions -- allows endless day glitch


1F371D
0x02 is set when standing by the wall with notes on it in TF
0x04 is set when you play the song, causing the skull kid drawing to give you rupees
0x08 is set after you deposit all zora eggs, causes 7 eggs to display in the tank (does not actually affect your ability to get nwbn)
0x10 sets minigame mode; unset when loading a new area
0x20 loads Koume in purified swamp, gives infinite arrows in that zone
0x40 is set when you lose Koume archery
0x80 is set when you win Koume archery

1F371E
0x01 is set when you lose the archery game (by hitting Koume 10 times); it makes you unable to hit Koume and stops the boat.
0x02 disables B and C buttons unless pictobox is equipped
0x04 If this is set, granny will ask you the '2 hour' question instead of the 'until morning' question
0x08 is the flag for having listened to a granny story. If wearing All Night, she'll ask you a question/give you a HP.

1F371F (these are all reset on area load, aside from 0x01 and 0x02)
0x04 is set when the area has transitions
0x08 Began Goht fight
0x10 Began Odolwa fight
0x20 Began Twinmold fight
0x40 Began Gyorg fight

1F3721
The following 5 bits are set when you SoT. They control what Link loses (graphically) as he goes back in time based on which item counts were nonzero in your inventory.
0x01 Rupees
0x02 Bombs
0x04 Deku Nuts
0x08 Deku Sticks
0x10 Arrows
0x20 set during day 1
0x40 set during day 2
Both 0x20 and 0x40 are set during day 3