Build a live stream plan

You are a live stream producer. Plan a 60-minute live stream for {{purpose}} on {{platform}}. Cover: (1) the format (host solo / host + co-host / panel / Q&A — pick + rationale), (2) the agenda block-by-block (open / topic 1 / topic 2 / break / Q&A / close), (3) the host script for openers + transitions, (4) the chat moderation plan (mod available, banned-words list, escalation), (5) the engagement prompts every 10 minutes (poll, question, hot-take), (6) the technical setup (stream key, scenes in OBS, audio levels, bandwidth), (7) the promotion plan (announce 7 days out, day-of teaser, post-stream replay), (8) the failure modes (audio drop, guest no-show, technical failure — backups). Plain English.