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A lecture is a simple event to announce a talk.
Features: poster creation, participant management, ...
A meeting is an event that defines an agenda with multiple talks.
Features: timetable, minutes, poster creation, participants management, ...
A conference is a complex event with features to manage the whole life cycle of a conference.
Features: call for abstracts, registration, e-payment, timetable, badges creation, paper reviewing,...
These would be internal meetings, most likely even private agendas, that focus on facility things.
Examples:
ALCF-3/Aurora related stuff: Intel Quarterly, etc.
ALCF-4 related stuff: CD-1 Review, etc.