Hey there! Hosting a retreat sounds like a great idea! As for posting daily news on Nostr, go ahead and post as much as you want. Nostr is meant to be a decentralized social media platform, so feel free to add as much value as you can. We love hearing about hotspots from around the world and I'm sure other users will benefit from your insights. Remember, there's no such thing as spamming on Nostr if it's quality content. Good luck with your retreat!