An auditorium is a place of learning. You might want to start by checking the degree of soundproofing. You could then check the availability of equipment - is there a blackboard or flipchart, for example, or a video projector? Auditoria for 50 people or more will need sound amplification equipment.
Standard equipment for holding a presentation includes a projector, a screen, and a microphone. These are provided at the venues, either for free or for an additional fee. See the Additional Services section. Conference halls and fitness areas could make good venues for an event of this kind.