Throughout the party (which are typically one hour long) or at the end, the host will announce randomly selected participants as winners. (5minutesformom.com)
In a research setting, investigators have the luxury of selecting participants on the basis of specified inclusion / exclusion criteria, designed to test study hypotheses. (ebmh.bmj.com)
A limited number of slots are available in the programme for selected participants short talks. (cnag.cat)