Login to: https://myacg.acg.org
On the left hand side of the screen, in the grey menu area, click "Invoices" under the Billing Menu.
You'll see all the payments that have been made, and you can choose to print the invoice.
You'll use the invoice as your receipt.
Still have questions?
Contact your chapter about the event you're looking for.
If you're having other issues related to your account, contact chapters@acg.org