There are several online platforms that offer curated collections of case studies, diplomatic negotiations, and global events specifically for Political Science and International Relations (PSIR) students. These platforms can provide valuable resources for students to enhance their understanding of real-world political scenarios and global dynamics. Here are some examples:

1. EduRev:
- EduRev is an online learning platform that offers a wide range of educational resources, including curated collections of case studies, diplomatic negotiations, and global events for PSIR.
- It provides access to a vast library of study materials, notes, and practice questions, all designed to help students excel in their PSIR studies.
- EduRev also offers a user-friendly interface, making it easy for students to navigate and find the desired resources.

2. OpenCourseWare Consortium:
- The OpenCourseWare Consortium is a collaboration of universities and educational institutions that provide free and open access to course materials, including case studies and lectures related to PSIR.
- This platform offers a wide range of resources from various universities, allowing students to access different perspectives and approaches to PSIR topics.
- The materials provided by the OpenCourseWare Consortium are typically in the form of lecture notes, presentations, and assignments, which can be used by students for self-study and research.

3. JSTOR:
- JSTOR is a digital library that provides access to academic journals, books, and primary sources in various disciplines, including PSIR.
- It offers a vast collection of case studies, research articles, and scholarly publications that cover a wide range of PSIR topics.
- JSTOR allows students to search for specific keywords, topics, or authors, making it easier to find relevant resources for their studies.

4. ResearchGate:
- ResearchGate is a social networking site for researchers and scientists, where they can share and access research papers, articles, and case studies.
- It provides a platform for PSIR scholars to connect and collaborate, allowing students to access a wide range of academic resources.
- ResearchGate also allows users to follow specific researchers or topics of interest, making it easier to stay updated with the latest developments in the field of PSIR.

In conclusion, there are several online platforms such as EduRev, OpenCourseWare Consortium, JSTOR, and ResearchGate that offer curated collections of case studies, diplomatic negotiations, and global events specifically for PSIR students. These platforms provide valuable resources for students to enhance their understanding of real-world political scenarios and global dynamics, thereby supporting their academic and research endeavors.