There are very few wrong times to introduce yourself and say hi to someone new. Bathrooms and funerals come to mind, but then I think of some pretty exciting people I've met in both places!
Maybe you'll find nothing in common. Maybe your "hi" will go unreciprocated, but you are no worse off than if you had done nothing. There's also a chance you'll connect with someone new, which can lead to new experiences, additional contacts, and maybe even a new friend or colleague. Opt for action.