Add blog post for PolicyEngine 2.0 London event

src/posts/articles/sep-2025-london-event.md

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+Join us at Central Hall Westminster in London on Thursday, 25 September 2025, from 12:00-18:00 for an exclusive showcase of PolicyEngine 2.0 and our latest innovations in evidence-based policy analysis. Register now on [Eventbrite](https://www.eventbrite.co.uk/e/policyengine-20-and-the-future-of-public-policy-analysis-tickets-1673065246189).
+
+## Event overview
+
+PolicyEngine is hosting a special event to demonstrate our cutting-edge research, tools, and features that are transforming how policymakers and researchers analyze tax and benefit reforms. This gathering brings together professionals at the forefront of computational policy modeling and evidence-based policymaking technology.
+
+## What to expect
+
+### Revolutionary platform updates
+
+Experience the unveiling of PolicyEngine v2, our next-generation policy analysis platform, with a live demonstration by our engineering team. See firsthand how our enhanced interface and capabilities make complex policy analysis more accessible and powerful than ever.
+
+### Hyperlocal policy analysis
+
+Discover our breakthrough capability to estimate policy impacts at the parliamentary constituency and local authority level. Our UK Country Director Nikhil Woodruff will demonstrate how our revolutionary microdata construction enables unprecedented granularity in understanding policy effects across the UK, expanding on the methodologies described in our [Enhanced CPS launch](/us/blog/enhanced-cps-launch).
+
+### Cutting-edge research presentations
+
+Learn about our latest research innovations, including:
+
+- **VAT analysis with synthetic firm microdata**: Our UK Research Associate Vahid Ahmadi presents groundbreaking work on modeling VAT reforms using fully synthetic firm-level data, building on our recent [analysis of VAT threshold changes](/uk/blog/uk-vat-thresholds)
+- **US policy modeling expansion**: Insights from our federal and state-level policy analysis work across the Atlantic, powered by our [Enhanced Current Population Survey](/us/blog/enhanced-cps-launch) microdata
+- **AI-powered policy analysis**: How we're deploying large language models and agentic systems to transform policy research workflows, supported by our [NSF POSE grant](/us/blog/nsf-pose-phase-1-grant)
+
+### Networking opportunities
+
+Connect with policy researchers, government officials, think tank professionals, academic researchers, and data scientists working in public policy. The event includes dedicated networking time during registration, tea break, and an evening reception.
+
+## Full agenda
+
+- **12:00-13:00** | Registration, Lunch & Networking
+- **13:00-13:15** | Welcome & Vision - Max Ghenis, Co-founder & CEO
+- **13:15-13:30** | Technology for UK Policymaking - Nikhil Woodruff, Co-founder, CTO & UK Country Director
+- **13:30-14:00** | Live Demo: PolicyEngine v2 Platform - Anthony Volk, Software Engineer
+- **14:00-14:30** | Localizing Policy Impact - Nikhil Woodruff
+- **14:30-15:00** | VAT Analysis with Synthetic Firm Microdata - Vahid Ahmadi, UK Research Associate
+- **15:00-15:30** | Tea Break & Networking
+- **15:30-16:00** | PolicyEngine US: Federal & State Policy Modeling - Max Ghenis
+- **16:00-16:30** | Panel Discussion: The Future of Evidence-Based Policymaking
+- **16:30-17:00** | Looking Ahead: AI-Powered Policy Analysis - Max Ghenis & Nikhil Woodruff
+- **17:00-18:00** | Reception & Networking
+
+## Acknowledgments
+
+This event is made possible by the generous support of the Nuffield Foundation, whose commitment to evidence-based social policy aligns perfectly with PolicyEngine's mission to democratize policy analysis.
+
+## Event Details
+
+**Date:** Thursday, 25 September 2025  
+**Time:** 12:00-18:00 GMT  
+**Venue:** Central Hall Westminster  
+**Address:** Storey's Gate, London SW1H 9NH
+
+## Registration
+
+Space is limited for this exclusive event. [Register now on Eventbrite](https://www.eventbrite.co.uk/e/policyengine-20-and-the-future-of-public-policy-analysis-tickets-1673065246189) to secure your place at this pioneering gathering in computational policy analysis.
+
+## About PolicyEngine
+
+PolicyEngine is a non-profit organization building free, open-source software to compute the impact of public policy. Our platform enables anyone to design tax and benefit reforms and see their effects on society and individual households. Learn more at [policyengine.org](https://policyengine.org).

src/posts/posts.json

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 [
+  {
+    "title": "Event: PolicyEngine 2.0 and the Future of Public Policy Analysis",
+    "description": "Join us on the afternoon of September 25th in London for an exclusive showcase of PolicyEngine's latest innovations in evidence-based policy analysis, featuring live demos and networking.",
+    "date": "2025-09-12",
+    "tags": ["uk", "org", "featured", "event"],
+    "filename": "sep-2025-london-event.md",
+    "image": "sep-2025-london-event.png",
+    "authors": ["max-ghenis"]
+  },
   {
     "title": "PolicyEngine and NBER sign memorandum of understanding for TAXSIM emulator development",
     "description": "Partnership ensures continuity of tax microsimulation capabilities for the research community through open-source development.",