I went to Block T in Smithfield for the first time a few weeks ago, thanks to its involvement in the monthly First Thursdays evenings, and I liked it a lot. It's a spacious venue with a relaxed, stylishly shabby look, and was a great setting for yesterday's Dublintellectual event. (Dublintellectual will return in September.)
This evening Block T is the venue for Hollywood Babylon, "Dublin's Midnight Movie Club". They're showing two films, starting at 22:00 and running until 02:00. First up is Wet Hot American Summer, a parody of summer camp movies, followed at midnight by Dazed & Confused.
The Facebook event page and Block T's website do not, unfortunately, list the price, but it's only a few Euros for the double bill and you can pay for just one movie if you'd prefer. It's a BYOB event.