MCPs › Productivity › Holiday Calendar
U.S. federal holidays with observed dates and business-day math. Example from an open-source kit.
Computed from public signals only — stars, package downloads and how many registries list it. It measures how established a project is, not whether it is safe or right for you.
Not monetized yet
Turn Holiday Calendar’s tool calls into revenue: one disclosed sponsored slot, 70% revenue share, fail-open by design.
Want top placement in Lulu’s Choice? Get in touch.
Install Holiday Calendar
For anyone using Holiday Calendar — no Lulu account neededclaude mcp add --transport http holiday-calendar https://starter.modernmustardseed.com/holidays
Real-time weather for any city, built on the lulu-ads widget gallery. First-party, free forever.
View server →FAQ
Run: claude mcp add --transport http holiday-calendar https://starter.modernmustardseed.com/holidays
Yes — it’s a remote MCP server, so no local install is needed.
ChatGPT: Settings → Connectors → Advanced → Developer mode → Add connector, then paste https://starter.modernmustardseed.com/holidays.
Claude.ai: Settings → Connectors → Add custom connector, then paste the same URL.
21 out of 100, computed from cross-registry traction signals (installs, stars, registry presence) — never influenced by sponsorship.
Similar servers
Works well together
Your server?
This is for the person who owns Holiday Calendar — adds Lulu Ads to your own code. Not the install steps above, those are for your users.
Copies a ready prompt: your coding agent installs the lulu-ads SDK, wires the slot, and applies the widget design guide.
or set up manually at getlulu.dev/publishers
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Managed hosting with monetization built in — waitlist.
[](https://getlulu.dev/mcps/holiday-calendar)