The 'grid-list' element is empty on the '/events' page which is why nothing appears. It's not a CSS issue and is more likely to be a JSON error.
As the site's designer has placed this site in 'Developer Mode' it is no longer using an up-to-date Squarespace template. This makes it difficult (impossible?) for anyone - including Squarespace Customer Care and forum users - to provide you with further advice or support. I therefore recommend contacting the original designer.
