The event location is described on the event web site. Words are fine and required but, as the saying goes, an image is worth more than a thousand words because it

Do not miss this opportunity to make potential visitors feel good about the event location!

Subjects

The event location gallery should contain pictures of the following at least:

Depending on the actual situation, you may want to publish more than one picture per item to emphasize details and/or atmosphere, e.g., a really cozy bar, recently renovated rooms, or special equipment of seminar rooms.

It's also a nice idea to publish some pictures of sights to see in the vicinity.

Creation

Some advise on taking pictures:

In case you do have to resort to suboptimal pictures for some reason: Use an image manipulation program! Even viewers like PMView come with a set of features that can improve a picture considerably: