If there are blocks of time where nothing looks appealing, then perhaps this is not the conference to attend. The latter is more useful if you are trying to build knowledge is a new area. Conferences that combine both are very useful. If you are looking for a conference that meets your needs, it is helpful to get on mailing lists for conferences. Join list serves in areas of interest as conferences are often announced in that media.
Many journals carry lists of upcoming conferences.
It is also helpful to set goals before you go. This can include making a list of the issues that are a concern in your workplace and then making a list of personal goals. This will help generate a list of what you want to bring back from the conference. Before You Go. Before going to a conference you must plan your time.