>>76595337
Might depend on where the club is. UK scene: at one end clubs have members ranging from national level athletes down to those out for a chat and maybe a trot round in a local XC league. These will have training groups on all surfaces catering to different ages and abilities. At the other you have small village/town clubs that will concentrate on park runs and road races.
Advantage of clubs that do track as well as road is that you can try out sprints, jumps and throws in training, which might suit some fitizens more than plodding along.
Socially, we all chat to each other and occasionally go for a meal or end up in a cafe or pub after training (depends on club tbf).
As far as meeting women, DON'T join just for that as they will spot it immediately and you will get an iffy rep: they all chat, particularly in training and in the stands at matches and all those <30 are on snapchat... Then again, things do happen and I have seen some unlikely parings over the years.