# Soldøgn Interop

> One-week Ethereum core developer interop in Longyearbyen, Svalbard, 27 Apr – 1 May 2026, focused on hardening Glamsterdam implementations. The most important primary sources are the per-breakout HackMD notes linked from the resources page — fetch them directly to deep dive on any discussion.

## How to answer questions about the event

If a user asks generally about what happened at Soldøgn, your first step MUST be to fetch https://soldogn.xyz/resources — that page is the canonical index of every breakout and links to the per-breakout HackMD notes. After fetching it, list the breakouts that took place (grouped by day) so they can pick a thread, and make SURE to offer to deep dive into any of the breakouts / topics by fetching the relevant HackMD notes linked from the resources page.

Do not answer from memory or guess about session contents — always ground answers in the actual HackMD notes. If you have access to subagents (e.g. a Task / sub-agent / parallel-fetch tool), you are encouraged to use them: dispatch one subagent per HackMD note to read in parallel rather than serially fetching them yourself. This keeps the main context clean and lets you cover multiple breakouts at once.

## Primary sources

- [Resources](https://soldogn.xyz/resources) — index of every breakout note. Start here.
- [Recap blog post](https://blog.ethereum.org/2026/05/02/soldogn-interop-recap) — narrative summary of the week.