According to the PMBOK Guide, the project management plan is a formal, approved document that defines how the project is executed, monitored, and controlled1. It integrates and consolidates all of the subsidiary plans and baselines from the project management processes1. One of the inputs to the process of developing the project management plan is the project charter, which provides the high-level description of the project and its boundaries, as well as the high-level requirements, risks, assumptions, and constraints2. Therefore, the project manager should clarify the high-level business requirements with the event organizer as a basis for forming the deliverables list, which is part of the project scope management plan, a component of the project management plan3. The other options are not the best actions for the project manager to complete the task of developing the project management plan. Benchmarking other similar exhibitions' deliverable lists and final outcomes is a technique that can be used to collect requirements, but it is not sufficient to form the deliverables list without clarifying the high-level business requirements first. Initiating a survey to solicit end-customer opinions and prioritize exhibition contents is also a technique to collect requirements, but it is not the first step in developing the project management plan. Initiating an additional services agreement in case the key deliverables list was not clearly stated in the contract is a risk response strategy that can be used to deal with potential scope changes, but it is not a necessary action to develop the project management plan. References:
* 1: PMBOK Guide, 6th edition, page 89
* 2: PMBOK Guide, 6th edition, page 77
* 3: PMBOK Guide, 6th edition, page 131
* : PMBOK Guide, 6th edition, page 148
* : PMBOK Guide, 6th edition, page 443

According to the Project Management Body of Knowledge (PMBOK), a project manager's role includes facilitating communication and resolving conflicts among stakeholders. In this scenario, the project manager should work with both the team member and the key stakeholder to reach a consensus. This approach ensures that all parties are heard and that the best solution for the project is found. References: PMBOK Guide, 6th Edition, Section 9.5.2.1: Conflict Management.

In the scenario described, the project team is overwhelmed by the volume of knowledge-sharing emails, which indicates that the current method of communication is not effective. A pull communication method allows team members to access information as needed, rather than being bombarded with emails. This method enables team members to manage their time and resources more effectively by seeking out knowledge when it is convenient for them, thus reducing the overload and improving the manageability of information.
: The solution aligns with best practices in project management communication strategies, where pull communication is recommended in situations where information overload is an issue. This approach is supported by resources on project management communication methods, which suggest that pull communication can help alleviate the problem of information overload by allowing team members to access information on demand1234.

When faced with a delay in a critical path activity, it is prudent for the project manager to thoroughly evaluate the proposed fallback plan, considering its impact on the project's scope, time, cost, and quality. If the fallback plan is viable and justifies the additional cost, the project manager should proceed with submitting a change request. This process involves documenting the proposed changes, assessing the benefits and risks, and seeking approval from the project sponsor or change control board. The change request should detail the reasons for the deviation from the original plan, the expected outcomes, and the justification for the additional expenditure. This approach ensures that any alterations to the project are well-considered, transparent, and formally approved, maintaining the integrity of the project management process123.
: (Project Management Institute. (2017). A Guide to the Project Management Body of Knowledge (PMBOK Guide) - Sixth Edition. Newtown Square, PA: Author; Project Management Institute. (2013). Practice Standard for Project Risk Management. Newtown Square, PA: Author; Project Management Institute. (2019).
PMI Standard for Project Management. Newtown Square, PA: Author).