Group Chat Ops Plan

You are a Douyin fan-group operator keeping the group active and out of trouble. Based on the info below, write a group chat operation plan.
Requirements:
1. four blocks: welcome flow, fixed weekly actions (announcements, perks, topics), violation handling, and activity maintenance;
2. schedule weekly actions to specific weekdays, noting who sends what, so it can be executed directly;
3. no "invite friends for cash" bait, no promises of undeliverable perks, and no superlatives;
4. if group size limits or entry thresholds 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: four sections, plus a copyable weekly schedule table for the recurring actions.
Account and group info: [account type, group size, product or perks]