Event Registration Form & Validation

I require a straightforward online form that lets people sign up for an upcoming event. The form only needs three fields—name, email and phone—yet it must feel polished and be quick to complete. My priority is reliable phone-number validation so I never receive incomplete or mistyped numbers... (Budget: ₹1500 - ₹12500 INR, Jobs: Data Integration, Frontend Development, Google Sheets, HTML, HTML5, JavaScript, PHP, Web Development)