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

 * Another Sword
 * Break the Curse
 * Suspicious Behavior
 * Sending the Signal
 * Arcane Secrets
 * Escaping the Past
 * A Lost Treasure
 * Noise from the Well
 * A Wounded Warrior
 * Trouble at the Bridge
 * Almost Dinner
 * A Giant Dilemma
 * Love Lost
 * Rest in Peace
 * Cleansing the Rot
 * Kill Officer Hagan

Dark Wood

 * Beast in the Woods
 * Beheaded
 * Demonic Ritual
 * Fighting Former Allies
 * Hijacked Supplies
 * Imprisoned
 * Kidnapped Patrol
 * Kill Kodi
 * Lunar Lupis
 * Ravenous Wolves
 * Reunion
 * The Call of the Woods
 * The Maddened
 * The Reckless Scout
 * Tough Vines
 * Young Hunter

Library of Zoltun Kulle

 * An Astounding opportunity
 * Animating Purpose
 * Crumbling Foundations
 * The Knowledge-eaters
 * Tides of Sand
 * Scorpion's Justice
 * Fate of the Eredicators
 * Stonebellu's Cure
 * Thieves of Comrades
 * What Skulls Below
 * Prize Hunter
 * Purity of Form
 * In Search of Strength
 * The Perfect Assistant
 * Chancel of Iron

Bilefen

 * Lord of Terroir
 * Two Dupes
 * Long Way Home
 * Broken Compass
 * Toothless William Thorpe
 * Let Us In
 * Foregone Dreams
 * Endless Strife
 * Spoiled Bait
 * The Leftovers
 * The Hermit's Grave
 * No Pain
 * The Cleanse
 * A Season of Charity
 * Night Auction

Shassar Sea

 * Ambush
 * Loyalty in Question
 * Desert Vintage
 * Tomb Robber
 * Unholy Ascension
 * Lairs and Greed
 * No Place for Children
 * Smelted Iron
 * The Enemy of My Enemy
 * Specialty Trading
 * The Origin
 * A Journey to the Past
 * External Investigation
 * A Teacher, A Father
 * Scepter of Desire
 * To Tabri

Mount Zavian

 * Mastery and Nothingness
 * Private Nightmares
 * Vigil for the Khazra
 * Controlled Burn
 * Shadows Are Broken Light
 * Your Money or Your Life
 * The Bond
 * Carnivore's Dilemma
 * More Than Love
 * Lost Lives
 * Tomb of the Word
 * Passing the Torch
 * Hordes of Horror
 * Faith's Banner
 * Free the Damned

Frozen Tundra

 * Frozen Nightmare
 * Restless Battle
 * Embracing Winter
 * Heart of the Storm
 * Arrival and Departure
 * In Direst Need
 * Icebreaker
 * Corrupted Altars
 * Overgrowth
 * Back to the Roots
 * Supplemental Warmth
 * Unusual Cold
 * Vision of Justice
 * Blood of the Last Elder
 * Chilling Bombardment

Realm of Damnation

 * Waiting Doom
 * The Hellfire Core
 * Damnation's Chosen
 * Toll of Flames
 * Visitor From Afar
 * One Right Choice
 * All Who Succumb
 * Blood Lure
 * Momentary Lapses
 * Horn of Harmony
 * Dead Eyes
 * Whispering Bones
 * Locally Sourced
 * Hellstorm
 * Present Pains