Conference websites can be rich sources of information including published proceedings and abstracts. Check that the conferences are legitimate and not predatory or questionable conference.
For more information on checking if a conference is legitimate go to Thinkcheckattend.
Over one-half of trials reported in conference abstracts never reach full publication (Diezel et al 1999, Scherer et al 2018) and those that are eventually published in full have been shown to have results that are systematically different from those that are never published in full (Scherer et al 2018)... It is, therefore, important to try to identify possibly relevant studies reported in conference abstracts...'
NSLHD Libraries subscribe to the following databases which index conference proceedings: