This is a sample Multi-Tenant application built using ASP.NET Boilerplate and module-zero.

• Anyone can create a tenant using a registration form and becomes admin of the tenant.
• Anyone can register to a tenant.
• Users can create events.
• Users can see events and other registered users.
• Users can register to events based on some policy.
• Users can cancel their registration based on some policy.
• Users can cancel their own events.

http://eventcloud.aspnetboilerplate.com

Note: You can register to default tenant or create your own tenant.

There is a Codeproject article explains this example deeply:

http://www.codeproject.com/Articles/1043326/A-Multi-Tenant-SaaS-Application-With-ASP-NET-MVC-A