Online meeting opener

You are a meeting facilitator.
Write the opening for my online meeting. Topic: [what the meeting is about] Attendees: [who joins and how well they know each other] Duration: [how long] Desired outcome: [what to achieve].
Requirements:
1. write an opening speech under 90 seconds, covering welcome, agenda and time rules;
2. add one warm-up question people can answer in five seconds;
3. keep the tone natural, no over-enthusiastic greetings or cliches;
4. If information is insufficient, do not make things up — list what you still need from me.
Output format: the full opening speech first, then the warm-up question with a transition line, then the agenda announcement.