I needed a firefly effect for an event and decided to make a helper mod because I couldn't find a good way to do it otherwise.
I will expand this helper mod if I need other effects.

currently there are only 3 actions.

action 1 and 2:
Fireflies

/// Usage:
/// action MiihauEventHelper_SpawnFirefly <tileX> <tileY> [durationMs] [baseRadius] [pulseAmplitude] [pulseSpeed] [color] [movementSpeed] [fadeInDurationMs] [fireflyId]
///
/// Example:
/// action MiihauEventHelper_SpawnFirefly 6 7 5000 0.9 0.1 0.3 #FF4938 15 3000 introGlow
///
/// Then later:
/// Usage:
/// action MiihauEventHelper_RemoveFireFly <id> [fadeOutDurationMs]
///
/// Example:
/// action MiihauEventHelper_RemoveFireFly introGlow

Example Event:
{ "Action": "EditData", "Target": "Data/Events/Forest", "Entries": { "{{ModId}}_fireFliesTest/F":" none/76 76/farmer 76 76 2/skippable/ pause 1000/ action MiihauEventHelper_SpawnFirefly 76 76 0 0.5 0.2 0.2 #863DFF 20 3000 firefly1/ message \"after firefly 1\"/ action MiihauEventHelper_SpawnFirefly 84 72 0 0.5 0.1 0.25 #863DFF 25 3500 firefly2/ pause 300/ action MiihauEventHelper_SpawnFirefly 83 76 0 0.55 0.13 0.15 #863DFF 25 2000 firefly3/ pause 100/ action MiihauEventHelper_SpawnFirefly 78 72 0 0.55 0.13 0.15 #863DFF 30 2000 firefly4/ message \"after adding more firefly\"/ action MiihauEventHelper_RemoveFirefly firefly1 3000/ message \"after removing firefly 1\"/ pause 2000/ message \"now spawning firefly with 3 second timer\"/ action MiihauEventHelper_SpawnFirefly 34 12 3000/ pause 3000/ message \"timed firefly removed\"/ pause 1000/ end/ ", } },

action 3:
CustomEmote

/// Usage:
/// action MiihauEventHelper_CustomEmote <actor> <PathToSpriteFile> <XposInSprite> <YposInSprite> <width> <height> [YOffset = 0]
///
/// Example:
/// action MiihauEventHelper_CustomEmote Abigail Characters\\Emily 1 4 15 13 12

Example Event:
{ "Action": "EditData", "Target": "Data/Events/Forest", "Entries": { "{{ModId}}_CustomEmoteTest/F":" none/36 12/farmer 35 15 2 Abigail 36 15 2 Penny 37 15 2 Vincent 38 15 2/skippable/ pause 2000/ pause 200/ emote Abigail 32 true/ emote farmer 32 true/ emote Penny 32 true/ emote Vincent 32/ pause 200/ action MiihauEventHelper_CustomEmote Abigail Characters\\Emily 1 4 15 13 12/ action MiihauEventHelper_CustomEmote farmer Characters\\Emily 1 4 15 28/ action MiihauEventHelper_CustomEmote Penny Characters\\Emily 1 4 15 13 12/ action MiihauEventHelper_CustomEmote Vincent Characters\\Emily 1 4 15 13 22/ pause 5000/ action MiihauEventHelper_CustomEmote Penny Characters\\Emily 1 4 15 13 12/ emote Abigail 32/ pause 1000/ action MiihauEventHelper_CustomEmote farmer Characters\\Emily 1 4 15 28/ pause 1000/ action MiihauEventHelper_CustomEmote Abigail Characters\\Emily 1 4 15 13 12/ pause 1000/ action MiihauEventHelper_CustomEmote Penny Characters\\Emily 1 4 15 13 12/ pause 1000/ action MiihauEventHelper_CustomEmote Vincent Characters\\Emily 1 4 15 13 33/ pause 3000/ emote farmer 32/ pause 200/ action MiihauEventHelper_CustomEmote farmer Characters\\Emily 1 4 15 28/ pause 2000/ emote Abigail 32/ pause 200/ action MiihauEventHelper_CustomEmote Abigail Characters\\Emily 1 4 15 13 23/ pause 1000/ emote Vincent 32/ pause 200/ action MiihauEventHelper_CustomEmote Vincent Characters\\Emily 1 4 15 13 22/ pause 2000/ end/ ", } },

Source Code

Miihau Event Helper