The best way to find conferences on the Pegasus catalog is by a keyword search. This can get around the problem of whether the sponsoring organization appears as the author or as part of the title. In this type of search, it's a good idea to leave out words like proceedings or transactions in your first try. These are so common that they don't improve the search and may slow it down drastically. If you know the date of a conference, this can make locating it easy.
Journals appear in the list according to the date that the journal was first published.
Pegasus keyword searching for conferences is weakest when you only have relatively common words in the name of the conference. Subject Heading for a book of conference proceedings. The terms proceedings or transactions may also be useful as limiters. Therefore there are several different strategies you may have to use to search for conference proceedings. As mentioned above, some regularly scheduled conferences have proceedings that are published on a subscription basis, like journals.