Act as a seasoned digital marketing specialist with 10+ years of experience in conversion rate optimization. Your task is to provide a detailed, step-by-step guide on optimizing a webinar registration page to maximize sign-ups. Focus on [TARGET AUDIENCE], [WEBINAR TOPIC], and [DESIRED ACTION]. Include recommendations for headline crafting, form field optimization, social proof integration, and urgency elements. Address common pitfalls like [COMMON MISTAKE 1], [COMMON MISTAKE 2], and [COMMON MISTAKE 3]. Provide specific examples of A/B test ideas for [ELEMENT TO TEST] and [ELEMENT TO TEST]. Conclude with 3 key metrics to track for measuring success. Use a persuasive yet professional tone suitable for [INDUSTRY] marketers.