- Dr. Vimal Katiyar Chaired a Session during NRC-2017 & ICEP 2018 February 23-25, 2018, Guwahati.
- Dr. Vimal Katiyar Chaired a Session on Biopolymers from Renewable Resources during 7th World Congress on Biopolymers and Polymer Chemistry, June 04-06, 2018, Osaka, Japan.
- Dr. Vimal Katiyar Chaired a Session during International Conference on Functional Materials, organized by Material Science Centre, IIT Kharagpur, December 12-14, 2016.
- Coordinator(India), 2nd Indo-Japan Bilateral Symposium on Future Perpective of Bioresource Utilization in North-East India IJBS 17, organized by IITG and GIFU University, Japan held at IIT Guwahati during 1-4 February, 2018.
- Coordinator(India), IITG-KIT 3rd Joint Symposium on Biobased Materials, IIT Guwahati, January 12, 2018.
- Organizing Chair, Fourth International Symposium in Advances in Sustainable Polymers ASP 17, organized by CoE-SusPol, Dept. of Chemical Engg., IITG and PPA, held at IIT Guwahati during January 8-11, 2018.
- Executive Chair, ASP-16, August 4-6, 2016, organized by Kyoto Institute of Technology Kyoto, Japan
- Indian Coordinator for KIT (Japan)-IITG Joint Symposium, August 3, 2016, Kyoto Japan.
- Coordinator, in Gifu-U/IITG & Gifu-U/UKM Joint Symposium on August 1, 2016, GIFU, Japan
- Joint Organizing Secretary of 68th Session of Indian Institute of Chemical Engineers ‘CHEMCON 2015’ during December 27-30, 2015 at IIT Guwahati.
- Second Symposium in Sustainable Polymers (ASP-15), Guwahati, January 21 – 22, 2015.
- IITG-KIT Joint Symposium on Biobased Materials, Jan. 20, 2015.
- First In-house Symposium on Technical Progress of Centre of Excellence for Sustainable Polymer (CoE-SusPol), Nov. 20, 2014.
- National Workshop on Molecular Modelling and Simulation of Sustainable Polymers and Nanocomposites (MSSP-14), Aug. 4-8, 2014.
- National School on Sustainable Polymers and First Symposium in Sustainable Polymers (ASP-14), Guwahati, January 6 – 11, 2014