I'm definitely not a designer, but a few things that stood out about the listings:
"I'm interested!" and "Launch hangout" are repeated a bunch of times... useful the first time, but distracting after that. Maybe there's a way to simplify them down to icons or single words with a tooltip or something?
The tags almost always repeat text in the title – I'd say just don't bother showing them in the rows.
The list would be easier to scan (visually) if the dates/times were distinguished from the titles.
I'm definitely not a designer, but a few things that stood out about the listings:
Hope that helps. Nice work!