RacketCon 2026 is a two-day public conference in Oakland, California (October 3-4) focused on the Racket programming language and its ecosystem, with in-person and livestream attendance options, recordings to follow, live chat, and discounted early registration. The program opens with a keynote by Pat Hanrahan on notation and includes an evening social and provided lunch. The schedule emphasizes practical language engineering, tooling, and system-level extensions, and concludes with “The State of Racket” and a town-hall for community discussion. Organizers enforce a Friendly Environment Policy and provide local information and volunteer contact details.
Talks present concrete technical advances and tools: a prototype type-inference that combines occurrence typing with algebraic subtyping to infer types for code generated by macros; Pille, a Rhombus-based language that uses an LLVM backend to bring high-level metaprogramming to low-level, high-performance targets; Treason, a macro-expansion strategy that enables robust IDE services via spec-driven subexpression expansion; Herbie, a Racket-written compiler that rewrites numeric expressions to improve floating-point accuracy; an untyped effect-handler library (_cio_) and discussion of its design tradeoffs; BrandX, a library for interfaces, generics, and contracts to modernize OOP in Racket; and ffi2, a new FFI layer combining dynamic convenience with static, efficient representations of foreign pointers.
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