What are tutorials in conferences?
I think this varies a lot from field to field. In High-performance Computing and Scientific Computing, tutorials are very likely to be a set of lectures and hands-on laboratory sessions giving attendees instruction in how to use a computer, API, or other software. This could include "Programming for Intel Xeon Phi", "Introduction to Computing System X", "Python for HPC", etc. (many of which I have personally been involved in teaching). These kinds of tutorials are typical of conferences like Supercomputing and IEEE Cluster.