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Step 1: Set up your AWS environment
To get started, you'll need to set up an AWS account if you don't already have one. Once you have an account, you'll need to create an IAM user with administrative privileges and create an AWS access key and secret key. You'll also need to create an S3 bucket to store your static assets and configure your AWS CLI to interact with your AWS environment.

Step 2: Create an AWS Amplify project
Once you've set up your AWS environment, the next step is to create an AWS Amplify project. Amplify is a development platform that makes it easy to build scalable and secure cloud-powered applications. To create an Amplify project, go to the Amplify console in the AWS Management Console and follow the on-screen instructions.

Step 3: Add authentication with Amazon Cognito
The next step is to add authentication to your e-commerce system using Amazon Cognito. Cognito is a fully managed identity and access management service that makes it easy to add user sign-up, sign-in, and access control to your applications. To add authentication with Cognito, go to the Amplify console, select the Authentication category, and follow the on-screen instructions.

Step 4: Create a data model with Amazon DynamoDB
Now that you've added authentication to your e-commerce system, the next step is to create a data model using Amazon DynamoDB. DynamoDB is a fast and flexible NoSQL database that makes it easy to store and retrieve data at scale. To create a data model with DynamoDB, go to the AWS Management Console, select the DynamoDB service, and follow the on-screen instructions.

Step 5: Create serverless APIs with Amazon API Gateway and AWS Lambda
The next step is to create serverless APIs with Amazon API Gateway and AWS Lambda. API Gateway is a fully managed service that makes it easy to create, deploy, and manage APIs at any scale. Lambda is a serverless compute service that lets you run code without provisioning or managing servers. To create serverless APIs with API Gateway and Lambda, go to the AWS Management Console, select the API Gateway and Lambda services, and follow the on-screen instructions.

Step 6: Build your front-end with HTML, CSS, and JavaScript
Now that you've set up your back-end, the next step is to build your front-end using HTML, CSS, and JavaScript. You can use any front-end framework you prefer, but for this project, we recommend using React. To build your front-end with React, you can use the Amplify CLI to generate a starter app or create your own from scratch.

Step 7: Deploy your e-commerce system
Finally, the last step is to deploy your e-commerce system to the cloud. You can use the Amplify console to deploy your front-end, APIs, and database or use the Amplify CLI to automate your deployment process.

Once you've deployed your e-commerce system, you can test it by signing up, signing in, and placing an order. You can also add additional features like payment processing, inventory management, and order fulfillment to make your e-commerce system even more robust.

In conclusion, building an event-driven e-commerce system project using AWS Amplify, Amazon Cognito, Amazon API Gateway, AWS Lambda, and Amazon DynamoDB can be a challenging but rewarding experience. By following these steps, you can create a scalable and secure e-commerce system that can handle a large volume of users and transactions.