diff --git a/app/api/admin_sales/events.py b/app/api/admin_sales/events.py
index 125b94a9c2..fad635508e 100644
--- a/app/api/admin_sales/events.py
+++ b/app/api/admin_sales/events.py
@@ -26,10 +26,13 @@ class Meta:
         inflect = dasherize
 
     id = fields.String()
+    identifier = fields.String()
     name = fields.String()
+    created_at = fields.DateTime()
     starts_at = fields.DateTime()
     ends_at = fields.DateTime()
     payment_currency = fields.String()
+    payment_country = fields.String()
     sales = fields.Method('calc_sales')
 
     @staticmethod
@@ -38,7 +41,7 @@ def calc_sales(obj):
         Returns sales (dictionary with total sales and ticket count) for
         placed, completed and pending orders
         """
-        return summary(obj.orders)
+        return summary(obj)
 
 
 class AdminSalesByEventsList(ResourceList):
@@ -48,7 +51,7 @@ class AdminSalesByEventsList(ResourceList):
     """
 
     def query(self, _):
-        return self.session.query(Event).outerjoin(Order).outerjoin(OrderTicket)
+        return Event.query
 
     methods = ['GET']
     decorators = (api.has_permission('is_admin'),)
diff --git a/app/api/admin_sales/marketer.py b/app/api/admin_sales/marketer.py
index b4888fa818..6b6ef1664d 100644
--- a/app/api/admin_sales/marketer.py
+++ b/app/api/admin_sales/marketer.py
@@ -33,7 +33,7 @@ def calc_sales(obj):
         Returns sales (dictionary with total sales and ticket count) for
         placed, completed and pending orders
         """
-        return summary(obj.orders)
+        return summary(obj)
 
 
 class AdminSalesByMarketerList(ResourceList):
diff --git a/app/api/admin_sales/organizer.py b/app/api/admin_sales/organizer.py
index e80673cb15..007c43f3ef 100644
--- a/app/api/admin_sales/organizer.py
+++ b/app/api/admin_sales/organizer.py
@@ -42,7 +42,7 @@ def calc_sales(obj):
         Returns sales (dictionary with total sales and ticket count) for
         placed, completed and pending orders
         """
-        return summary(obj.orders)
+        return summary(obj)
 
 
 class AdminSalesByOrganizersList(ResourceList):
diff --git a/app/api/admin_sales/utils.py b/app/api/admin_sales/utils.py
index 2a70b8fdae..c74a460295 100644
--- a/app/api/admin_sales/utils.py
+++ b/app/api/admin_sales/utils.py
@@ -2,22 +2,50 @@
 This module contains common sales calculations that are used throughout the
 admin section
 """
+from sqlalchemy import func
 
+from app.models.order import Order
+from app.models.ticket_holder import TicketHolder
 
-def status_summary(orders, status):
+
+def status_summary(sales_summary, tickets_summary, status):
     """
     Groups orders by status and returns the total sales and ticket count as a
     dictionary
     """
+    sales = 0
+    tickets = 0
+
+    for sale_status, sale in sales_summary:
+        if sale_status == status:
+            sales = sale
+
+    for ticket_status, ticket in tickets_summary:
+        if ticket_status == status:
+            tickets = ticket
+
     return {
-        'sales_total': sum(o.amount for o in orders if o.status == status),
-        'ticket_count': sum(o.tickets_count for o in orders if o.status == status),
+        'sales_total': sales,
+        'ticket_count': tickets,
     }
 
 
-def summary(orders):
+def summary(event):
     """
     Returns sales as dictionary for all status codes
     """
+    sales_summary = (
+        Order.query.filter_by(event_id=event.id)
+        .with_entities(Order.status, func.sum(Order.amount))
+        .group_by(Order.status)
+        .all()
+    )
+    tickets_summary = (
+        TicketHolder.query.join(Order)
+        .filter(Order.event_id == event.id)
+        .with_entities(Order.status, func.count())
+        .group_by(Order.status)
+        .all()
+    )
     status_codes = ['placed', 'completed', 'pending']
-    return {s: status_summary(orders, s) for s in status_codes}
+    return {s: status_summary(sales_summary, tickets_summary, s) for s in status_codes}