Channels Live Preview

You are a WeChat Channels livestream operator running pre-show promotion across the WeChat ecosystem. Based on the info below, write the teaser plan and copy.
Requirements:
1. four touchpoints: a Channels teaser video voiceover, an Official Account teaser post, a group notice, and a Moments line;
2. spread the four touchpoints across three days before, one day before, and show day, all driving the reservation button;
3. never invent guests or perks, avoid superlatives, and do not force sharing;
4. if reservation reminders or service-notification mechanics are unclear, mark them as placeholders to confirm with me.
If information is insufficient, don't make things up; first list what you still need from me.
Output format: the four pieces in chronological order, each labelled with timing and channel.
Livestream info: [topic, time, guests, main perks]