Base Game:

Wedding 
Egg Festival
Flower Dance 
Luau outfit 
Dance of the Moonlight Jellies 
Stardew Valley Fair 
Spirit's Eve 
Festival of Ice 
Feast of the Winter Star 
Desert Festival 
Trout Derby 
Night Market 
SquidFest

Ridgeside Village Festivals:

Ridgeside Gathering 
Ember Of Resolution 

Stardew Valley Expanded:

Community Day 

Downtown ZUZU:

Block Party

Festival Mods:

Surfing Festival 

New Years Eve : please note with new years eve on you have to turn feast of the winter star off because they are on the same day so sorry for any inconvenience
 
Love Festival 

Fireworks Festival 

Ferngill Fashion