Andrew White from the quantum technology laboratory at the University of Queensland, Australia, maintains an excellent web page listing conferences related to quantum technology around the world.   You can find his most recent listing for 2021 conferences here.

Harrisburg University maintains a web page called Quantumapalooza which provides a listing of free online learning opportunities for the Quantum Computing community.

In addition to the conferences shown on the lists mentioned above, here are some additional conferences:
The Second European Quantum Technology Conference (EQTC) has been postponed until November 29, 2021 to December 2, 2021 and will be held as a virtual conference.  This will be a follow-on to the first EQTC conference held in Grenoble, France in 2019. EQTC 2021 will provide full coverage of the most prominent and recent advances in European and International quantum technology activities across basic sciences, communication, computing, simulation and sensing/metrology. The conference program addresses a wide range of topics in quantum technologies including fundamental science, infrastructure development, industry engagements, education & training, encouraging and facilitating gender balance in the quantum community, international cooperation, and policy-making. It will provide a forum to highlight the state-of-the-art in quantum technologies both in Europe and from around the world.

The Quantum Computing at Berkeley Student Club will hold a hybrid (both on-site and virtual) event on December 2, 2021 titled Why Quantum Computing Deserves Your Attention Anyway, But Especially NowSpecial guest will be Jack Hidary, Director of AI/QC at Alphabet and author of Quantum Computing: An Applied Approach. The event is a no-cost time-effective triple play: learning for beginners, QC professional speaker, and interaction with industry providers.

The Women in Quantum Summit VI will be held on December 6-8, 2021 and will be co-located with the Q2B Conference in Santa Clara, California. Speakers will be presenting on December 6 with a Career Fair and a WIQ Award ceremony held on December 7 or 8. It will be an in-person event, but portions of it will be livestreamed.

The fifth annual Q2B Conference will take place as an in-person conference on December 7-9. 2021 in Santa Clara, California. The event emphasizes practical quantum computing and allows end users, hardware developers, software developers, and others to interact with world-class speakers to discuss the future of quantum computing.

The 51st Winter Colloquium on the Physics of Quantum Electronics (PQE 2022) will be held on January 10-14, 2022 in Snowbird, Utah. It is is an annual physics conference that covers all of quantum physics, laser science, quantum and nonlinear optics, and many other areas.

Inside Quantum Technology will have a conference focusing on quantum communications on February 21-23, 2022 in The Hague in the Netherlands.

Quantum Australia 2022 organized by the Sydney Quantum Academy will be held as in-person and online event on February 23-25, 2022. The conference and careers fair will bring together world-leading quantum researchers, businesses, government decision-makers, startups, and big tech to share developments and ideas. The conference will hear from Australian and international leaders driving the development of the quantum economy.

The 2nd Workshop on Quantum Software Architecture (QSA) will be held on March 12, 2022 in Honolulu, Hawaii. The workshop will be co-located with ICSA 2022. The goal of the QSA workshop is to bring together researchers and practitioners from different areas of quantum computing and (classical) software architecture to strengthen the quantum software community and discuss architectural styles and best practices of quantum software as well as other aspects of the quantum software development lifecycle. The workshop offers a platform for the presentation of novel scientific ideas as well as practical experiences and enables the exchange with experts from different areas of quantum computing.

The 25th Annual Conference on Quantum Information Processing (QIP 2022) will take place March 7-11, 2022 in Pasadena, California. Tutorials will also take place on March 5-6, 2022. This conference is the premier annual meeting for theoretical quantum information research. Since the first meeting in Aarhus, Denmark in 1998, the conference has featured breakthroughs by leaders in the disciplines of computing, cryptography, information theory, mathematics, and physics. The scientific objective of the series is to gather the theoretical quantum information community to present and discuss the latest groundbreaking work in the field.

The APS March 2022 Meeting will be held as an in-person event in Chicago, Illinois on March 14-18, 2022. This meeting is expected to include over a global audience of over 12,000 physicists, scientists, and students representing 30 APS Units and Committees and explore groundbreaking research from industry, academia, and major labs. The conference will include significant content related to quantum technologies.

Quantum Business Europe 2022 has been scheduled for March 23-24, 2022. More information about this conference will be posted when it is available.

The Quantum Computing Theory in Practice workshop will take place in Bristol, UK on April 11-13, 2022. More information about this conference will be posted when it is available.

Inside Quantum Technology will have an event focusing on quantum computing in San Diego, California on May 10-12, 2022

Alpha Events will be holding its Quantum.Tech Boston conference as an in-person event on June 13-15, 2022 at the Boston Marriott Copley Place. More information about this conference will be posted when it is available.

The IEEE Quantum Week 2022 will be held on September 18-23, 2022 in Broomfield, Colorado. More information about this conference will be posted when it is available.

Alpha Events will be holding its Quantum.Tech London conference as an in-person event on September 27-28, 2022 at Twickenham Stadium. More information about this conference will be posted when it is available.