The question is about an agile project, where the team works in iterations or sprints to deliver incremental value to the customer. In such a project, the project manager needs to monitor the team’s performance and knowledge gaps regularly and provide feedback and support. Two project events that can help the project manager to do this are:

Retrospective: This is a meeting held at the end of each sprint, where the team reflects on what went well, what went wrong, and what can be improved in the next sprint. The retrospective allows the team to identify and address any issues or impediments that affect their work, including knowledge gaps. The project manager can facilitate the retrospective and help the team to find solutions or resources to fill the knowledge gaps12

Backlog refinement: This is a process of reviewing and updating the product backlog, which is a prioritized list of features or requirements that the team needs to deliver. The backlog refinement helps the team to clarify and decompose the requirements, estimate the effort and complexity, and plan the upcoming sprints. The project manager can participate in the backlog refinement and help the team to understand the requirements and resolve any ambiguities or uncertainties13

The other options are not as relevant or effective as the retrospective and backlog refinement for the purpose of the question. Requirements analysis is a process of eliciting, analyzing, and validating the requirements, which is usually done before the project starts or during the initiation phase. It is not a specific event that occurs regularly during an agile project4 Sprint planning is a meeting held at the beginning of each sprint, where the team selects the requirements from the product backlog and commits to deliver them within the sprint. It is not a suitable event to assess the team’s knowledge gaps, as it focuses on the scope and schedule of the sprint1 Standup is a daily meeting where the team members share their progress, plans, and problems. It is a useful event to monitor the team’s work and identify any blockers, but it is not enough to address the team’s knowledge gaps, as it is usually brief and focused on the current tasks1

 1: A Guide to the Project Management Body of Knowledge (PMBOK® Guide) – Sixth Edition, Chapter 6, Section 6.3.2.2 2: PMI Agile Practice Guide, Chapter 5, Section 5.2.3 3: PMI Agile Practice Guide, Chapter 5, Section 5.2.2 4: Business Analysis for Practitioners: A Practice Guide, Chapter 3, Section 3.1