I'll try and make it if I can, but won't know until the day before.
There are quite a few pubs near the train station in Gravesend, as it's close to the town centre. I've only really been to Wetherspoons (The Robert Pocock) before, so I'm not much help - it's usually pretty busy in there at the weekend.
Also, the FA Cup Quarter Finals are on that weekend, so may want to avoid pubs with TVs