They could hold either. It is not an important difference, and I can well imagine that institutions across the west are holding both.
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It depends on the purpose of the meeting. If it's to have a presentation about certain facts, it's informative. If it's to allow students to come in and gather what information they need, it's informational.
A newspaper article or a speech give information - that's informative. A map, or a bunch of pamphlets allows anyone to pull out the information they want - that's informational.