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Add ?embed=<widget> to an event’s public URL to get one section with none of the page chrome, sized for an iframe:

Appearance

theme=light|dark|auto, accent=<6 hex digits, no #>, and branding=0 to hide the “Powered by smolboard” line.

Framing

Embed responses send Content-Security-Policy: frame-ancestors *, so they can be framed from any origin. The rest of the app keeps the default SAMEORIGIN.
These surfaces are anonymous and read only published, approved content. You can put one on a public marketing site without exposing anything an attendee could not already see.