How Startup Newsletter Writers Can Create an Event Invitation Sequence During Building a Drip Email Campaign — ChatGPT for Advanceds

You are an expert startup growth email strategist with 12 years of experience helping newsletter teams design event-driven drip campaigns that turn passive subscribers into active referral participants. Help me create an event invitation sequence so I can increase referral signups from email within a structured drip campaign architecture. My situation: - My startup's newsletter niche and audience is: [NICHE AND AUDIENCE DESCRIPTION, e.g., B2B SAAS FOUNDERS / CLIMATE TECH INVESTORS / EARLY-CAREER PRODUCT MANAGERS] - The event I am building the invitation sequence for is: [EVENT TYPE, e.g., VIRTUAL SUMMIT / PRODUCT DEMO DAY / COMMUNITY LAUNCH / LIVE AMA / COHORT KICKOFF] - My current newsletter list size is: [NUMBER] subscribers, and my average open rate is: [X%] - The referral signup mechanism I am using is: [UNIQUE REFERRAL LINK / INVITE CODE / SHARE-TO-UNLOCK / MANUAL REFERRAL SUBMISSION] - The biggest gap in my current drip strategy is: [NO SEQUENCE STRUCTURE / SINGLE EMAIL BLASTS ONLY / NO REFERRAL INTEGRATION / INCONSISTENT SEND CADENCE / POOR SUBJECT LINE PERFORMANCE] - My email platform and automation capability is: [CONVERTKIT / BEEHIIV / SUBSTACK / MAILCHIMP / HUBSPOT / OTHER — NOTE AUTOMATION LEVEL] - My event date is: [X WEEKS FROM NOW], and my referral signup target is: [NUMBER] new signups per event Deliver: 1. A 6-email event invitation drip sequence structured across 3 phases — awareness on days 1 and 4, urgency on days 8 and 12, and referral amplification on days 15 and 18 — with a subject line, 100 to 130 word body, and referral CTA for each email 2. A referral mechanics integration guide showing exactly where and how to embed the referral ask in each phase of the sequence without disrupting the event narrative or making the email feel transactional 3. A drip campaign architecture diagram in text format showing email triggers, delays, segment branches for registrants versus non-registrants, and referral sender versus non-sender paths 4. A subject line performance prediction framework identifying which subject line patterns — curiosity gap, exclusivity signal, social proof reference, urgency countdown — perform best with early-stage startup audiences, with 3 tested examples for each pattern 5. A referral conversion optimization guide covering 5 specific tactics for startup newsletter contexts — social currency framing, progress bar mechanics, reciprocity triggers, community identity language, and milestone-based reward reveals 6. A post-event re-engagement email sent within 48 hours of the event that converts non-attendees into future-event registrants and active referrers, under 120 words, with a referral link and a replay access hook 7. A drip campaign analytics framework specifying which 6 metrics to track per email in the sequence — open rate, click rate, referral click rate, referral conversion rate, unsubscribe rate, and reply rate — with a decision rule for killing or iterating each email based on performance 8. A 90-day drip campaign calendar template for a startup newsletter team running 4 events per quarter, showing how to nest event invitation sequences inside a consistent weekly newsletter cadence without creating send fatigue **Build every output as a scalable system, not a one-time campaign — every sequence, framework, and calendar must be designed for a two-person startup newsletter team to operate, iterate, and repeat across multiple events without rebuilding from scratch each time.**