Space is important. Depending on the size of your meeting, you will have to find a suitable meeting space to fit the attendees. For example, hosting a meeting of about 20 people in a 200 capacity hall might seem a bit wasteful and make your meeting look empty.
However, hosting the 20 people in a smaller meeting room with enough space to move and walk around would be the most ideal. If you require a larger meeting venue to accommodating a larger number of guests, do take in to account the availability of facilities such as access to restrooms, restaurants, rooms and leisure facilities.