A list of data mining research conferences, workshops, and meetings. Some of them are as follows:

[1] SIAM Conference on Data Mining (SDM 2011)
This conference provides a venue for researchers who are addressing these problems to present their work in a peer-reviewed forum. It also provides an ideal setting for graduate students and others new to the field to learn about cutting-edge research by hearing outstanding invited speakers and attending tutorials (included with conference registration). A set of focused workshops are also held on the last day of the conference. The proceedings of the conference are published in archival form, and are also made available on the SIAM web site.
Website: http://www.siam.org/meetings/sdm11/

[2] SIGKDD Conference on Knowledge Discovery and Data Mining
The annual ACM SIGKDD conference is the premier international forum for data mining researchers and practitioners from academia, industry, and government to share their ideas, research results and experiences. KDD-2011 will feature keynote presentations, oral paper presentations, poster sessions, workshops, tutorials, panels, exhibits, demonstrations, and the KDD Cup competition.
Website: http://kdd.org/kdd/2011/

[3] ACM SIGMOD 2011
The annual ACM SIGMOD/PODS conference is a leading international forum for database researchers, practitioners, developers, and users to explore cutting-edge ideas and results, and to exchange techniques, tools, and experiences.
Website: http://www.sigmod2011.org/index.shtml

[4] IJCAI 2011
The IJCAI-11 Program Committee invites submissions of technical papers for IJCAI-11, to be held in Barcelona, Spain, July 19-22, 2011. Submissions are invited on significant, original, and previously unpublished research on all aspects of artificial intelligence. The theme of IJCAI-11 is “Integrated and Embedded Artificial Intelligence” (IEAI) with a focus on artificial intelligence that crosses discipline boundaries within AI, and between AI and other disciplines. Building systems often requires techniques from more than one area (e.g. both machine learning and natural language processing, or both planning and preference representation). In addition, larger systems often have AI components embedded within that provide intelligent functionalities such as learning and reasoning. The conference will include a special track dedicated to such work.
Website: http://ijcai-11.iiia.csic.es/

[5] ECML PKDD 2011
The European Conference on Machine Learning and Principles and Practice of Knowledge Discovery in Databases (ECML PKDD) will take place in Athens, Greece from September 5th to 9th, 2011. This event builds upon a very successful series of 21 ECML and 14 PKDD conferences, which have been jointly organized for the past ten years.
Website: http://www.ecmlpkdd2011.org/

Other Conferences:

[6] TDWI World Series Conference
What is your corporate data strategy? Most business and IT professionals point to their data models, data quality tools, or even a spreadsheet data “dictionary.” Maybe you’re just getting started with a new data quality project. Maybe you already have several data management initiatives in place and are making good progress. Or perhaps you’ve recently inherited the mess someone else made. In any case, does your right hand know what your left is up to? Several departmental data initiatives—even successful ones—do not equal a corporate data strategy. TDWI fosters a community of learning where business and technical professionals come together to gain knowledge and skills, network with peers, and advance their careers. Through education and research programs, TDWI enables individuals, teams, and organizations to leverage information to improve decision making, optimize performance, and achieve business objectives.
Website: http://events.tdwi.org/events/las-vegas-world-conference-2011/home.aspx?utm_source=AttendeeMktg&utm_medium=E-Mail&utm_campaign=lv20g

Realizing the popularity, and the need of Data Mining in the road ahead, has resulted into organizing many more conferences (also conferences into  many more specialized data mining streams) to be held all over the world. So, many more conferences, lots of research and great innovations and discoveries lay ahead.