Here's a guide, but be creative with your PI/QBR events and keep track of a checklist.
For organisers
Pre-event communications
Have you identified the key stakeholders & attendees?
Has the QBR memo been circulated?
Has the agenda been circulated?
Have briefing slides/info been circulated with guidance for each session?
Meeting rooms (in Google Meet)
Has a Google meeting room been set up for the event & each Squad in the Initiative/Product
Is there a central Big Room (if in-person planning event)
Confirmation that all Squads rooms have been set up at a squad and key stakeholders level in line with the PI/QBR agenda (- most especially, if the event is for 2-day planning sessions)
Miro collaboration board
Has a Miro board been established for the event?
Has the link to the Miro board been circulated to participants?
Is a link to the previous Miro board available for reference?
Are Scrum Masters and Product Owners set up as editors of the Miro board?
Is there a confirmation that all SMs, POs and Squads can access the Miro board to capture content during the PI/QBR event?
For Squads
Capacity planning
Has the Squad's capacity been identified and understood?
Stories
Have Stories been created representing the work that the Squad knows will need to be done, based on the Epics, outlined in the QBR memo?
Do the Stories have
A description that could be understood by anyone working on the Initiative?
An assignee?
Acceptance criteria?
A link to the parent Epic that gave rise to the Story?
Planning and prioritisation
Does each sprint have a notional sprint goal? Is this written down?
Have dependencies and synergies with the work of others been identified?
Are risks, issues, assumptions, and dependencies recorded on the Miro board?
Retrospective items and kudos during and at the end of the event?