- Lunar Revel 2014 (Year of the Horse)
- Win games with one of the temporary icons to earn points for that faction. At the end of the event, each Region will permanently unlock the icon of the faction that earned the most points.
Pick 'em (World Championship)
Clash Beta 2017/2018
- Completing Missions
- Redeeming Tokens
- Freljord 2013
- Win 10 games with one of the temporary icons to permanently unlock that icon. Only one can be permanently unlocked, and you may work toward any of the other icons before the event ends - but starting progress on another icon will remove all previous progress.
- Bilgewater 2015 - You may only earn one icon from each act.
Seasonal summoner icons sometimes return as part of subsequent festivities and are sometimes referred to as vaulted (by contrast to 'limited'), but are not considered part of the Legacy Vault for the purposes of mystery icons or loot drops.
- Crafting (by using one Golden Lunar Revel Token)
- Event Participation
- Hextech Crafting
- Snowdown 2017 - You only could earn one icon