| Europe’s largest hydrogen and fuel cells exhibition 2021 | 开始日期：2021-04-12 结束日期：2021-04-16 | | | Germany Hall 27, C66 Exhibition Grounds Hannover, Germany | | https://magnetism.org/ |
| 6th World Congress on Integrated Computational Materials Engineering (ICME 2021) | 开始日期：2021-04-18 结束日期：2021-04-22 | | | USA Lake Tahoe, Nevada | | https://www.tms.org/icme2021 |
| 2021 2nd International Conference on Frontiers of Nanomaterials and Nanotechnology (NanoMT 2021) | 开始日期：2021-04-19 结束日期：2021-04-21 | 2021-01-15 | 2021-01-25 | Singapore | IASED | http://www.nanomt.org/ |
| 2021 2nd International Conference on Frontiers of Smart Materials and Structures (CFSMS 2021) | 开始日期：2021-04-19 结束日期：2021-04-21 | 2021-01-15 | 2021-01-25 | United States of America Singapore | IASED | http://www.cfsms.org/ |
| MST 2021 - 2021 Spring International Conference on Material Sciences and Technology (MST-S) | 开始日期：2021-04-20 结束日期：2021-04-22 | 2021-03-22 | | China Xi’an Grand Dynasty Culture Hotel | | https://www.scetconf.org/conference/SCET2021/MST.htm |
| 2021年国际材料与制造技术会议（ICMMT 2021） | 开始日期：2021-04-23 结束日期：2021-04-26 | 2020-12-15 | 2020-12-15 | 新加坡 | | http://www.icmmt.org/index.html |
| ICEMEE 2021 - 2021 7th International Conference on Energy Materials and Environment Engineering (ICEMEE 2021 ) | 开始日期：2021-04-25 结束日期：2021-04-27 | 2021-04-25 | | China Zhangjiajie | | http://www.icemee.net/ |
| ICIEM 2021 - 5th International Conference on Innovative Engineering Materials (ICIEM 2021) | 开始日期：2021-04-28 结束日期：2021-04-30 | 2020-12-10 | | Russia Moscow | | http://www.iciem.org |
| 5NANO 2021 - International Conference on Nanoelectronics, Nanophotonics, Nanomaterials, Nanobioscience & Nanotechnology | 开始日期：2021-04-29 结束日期：2021-04-30 | 2020-12-30 | | India Ettumanoor | | https://www.5nano2021.com/ |
| ICEMA 2021 - 6th International Conference on Energy Materials and Applications (ICEMA 2021) | 开始日期：2021-05-05 结束日期：2021-05-07 | 2020-11-20 | | France Strasbourg | | http://www.icema.org |
