Issue 339: Early Bird DjangoCon US Tickets Ending Soon

Django News Newsletter issue 339 covers early bird ticket sales for DjangoCon US 2026 ending May 31st, recent Django pull request highlights including CSP nonce support in built-in templates, a bug fix for HttpResponse.reason_phrase, and queryset ordering fixes. Also featured: a PostgreSQL 17-to-18 upgrade guide on Ubuntu 26.04, articles on Django StreamingHttpResponse for performance, a custom semi-static Django site using SQLite and Jinja2, Django 6.1 alpha 1 release, GSoC 2026 experimental flags framework discussion, Django Fellow reports, upcoming events including Wagtail Space NL and Django on the Med, and new open source projects.