User Accounts System and Event Registration

Hi there, 

I'm kind a looking for a complex system or integration for my esports website that needs the following features:
- To register members, with unique User Names and Passwords, verification via email and/or SMS.

- For the users to have their personal profile pages, with their user names and a list of competitions they have participated in

- To register for gaming events (free and paid) with their user names and passwords. 

- To automise unique tickets with QR codes to be sent to their emails. 

- Scan QR codes at the venue to confirm attendance to the event.

- To send marketing emails to members

Currently I've managed to set up a system that can do all that but I'm using. Google Spreadsheets, automations with Zapier, and other system for QR code creation and Email Automations and SMS automations. 

If there's a way to combine everything and adding the component of member registrations, it would be the perfect solution for us. Any recommendation would be highly appreciated.