The important information is larger and more legible in the poster on the left. I can locate the schedule, address, phone number and URL immediately.

In the poster on the right, my eye is drawn to the enormous headings, which contain no useful information by themselves. The "Come Visit" heading isn't close enough to the address, and the address/phone/URL has been squeezed into a single block of tiny, fuzzy text. Compare that to the left poster, where each one is distinct from the other.

I feel the need to put on my glasses to read the one on the right, but not the one on the left. That alone indicates a major issue and potential loss of audience.