Collaborative Event Planning Web Application

I'm looking for a responsive web application that facilitates collaboration among hosts, venues, and event vendors for efficient event planning.

Key Features:
- User Profiles: There should be distinct profiles for hosts, venues, and vendors.
- Event Planning Tools: The application must include robust tools for planning various aspects of an event.
- Messaging System: A built-in communication system is essential for users to coordinate seamlessly.

Authentication:
- Users should be able to sign in using their social media accounts.

Ideal Skills and Experience:
- Proficiency in web application development
- Experience in creating interactive user interfaces
- Knowledge of building secure, scalable user authentication systems
- Proven track record in developing event planning tools
- Experience in integrating messaging systems within web applications.

Please note, the specifics of the user interface have not been decided yet. I am open to suggestions and ideas from professionals in this field.