[
  {
    "id": "spring_festival",
    "name": "Spring Festival",
    "description": "Celebrate the season! Special Hero players appear in the market. Activate manually to begin.",
    "event_type": "seasonal",
    "starts_at": null,
    "expires_at": null,
    "is_manual": true,
    "effects": {
      "pack_weight_boosts": [],
      "bonus_market_cards": [
        "card_hero_001",
        "card_hero_002",
        "card_hero_003"
      ],
      "unlocks_sbc_ids": [],
      "unlocks_objective_ids": []
    }
  },
  {
    "id": "icon_weekend",
    "name": "Icon Weekend",
    "description": "Legendary Icons are available on the market. Activate manually to begin.",
    "event_type": "special",
    "starts_at": null,
    "expires_at": null,
    "is_manual": true,
    "effects": {
      "pack_weight_boosts": [
        { "rarity": "icon", "multiplier": 5.0 }
      ],
      "bonus_market_cards": [
        "card_icon_001",
        "card_icon_002",
        "card_icon_003",
        "card_icon_004",
        "card_icon_005"
      ],
      "unlocks_sbc_ids": [],
      "unlocks_objective_ids": []
    }
  }
]