Custom WordPress Site Like Meetup

I'm looking for an experienced WordPress developer to create a site similar to meetup.com, with a professional and clean visual style. The site should allow users to RSVP to events, comment on them, and share them on social media.

Core functionalities needed:
- User registration and profile management
- Event creation and management
- Group creation and interaction

Ideal skills and experience:
- Strong WordPress development background
- Experience with event management plugins
- Knowledge of user interface design for a professional look
- Familiarity with social media integration

Please share relevant portfolios and any similar projects completed.