Side Quests

Side Quests (formerly named Dynamic Events) are a type of quest in Diablo Immortal.

Side Quests vary in nature; ambushes, people requesting aid, wave-based events, bosses, objective-based events, multi-stage events, etc. They can be taken on with other players. They always have random chest rewards. On Hell 1+ difficulty, Taite can also direct players to random side quests in a zone.

Once per day Taite can direct players to Side Quests.

Explanation by Taite
"[Unlocking side quests] [Refreshing Quests] [Other details]
 * Once per day, you can unlock 3 side quests in a single zone to complete for bonus rewards.
 * Each day at 3 am, new quests become available to claim; unclaimed quests from the previous day roll over to the next day.
 * You can pay the Adventurer Seeker a fee to get a lead on a different set of quests.
 * After you’ve purchased a lead from the Adventure Seeker, it won’t disappear until you complete or abandon the associated quests.
 * If you have an active side quest in your log, you must complete or abandon it before you can undertake a new side quests.
 * You can earn Adventure Journals, which allow you to unlock Elite quests, by completing Elite Quest objectives in the Codex. You’ll be able to acquire more as you gain levels."

- Taite

List
As of launch, there are over 50 Side Quests in the game.

Ashwold Cemetery

 * A Wounded Warrior
 * Cleansing the Rot
 * Kill Officer Hagan
 * Sending the Signal

Shassar Sea

 * Ambush
 * Desert Vintage
 * The Enemy of My Enemy