Most foreign language apps teach in bite sized pieces. I use Mango, but there are a bunch.

Otherwise just get trained in first aid, trip them, and carry around a bunch of bandaids and rubbing alcohol. The Florence Nightingale syndrome is sure to kick in as you tend to their wounds.

Use “social props.” I’m not sure if that’s a real term, but like the colored-hair guy said, it’s about creating an easy conversation starter and giving people “permission” to approach you. An interesting hat, reading a book where people can see the cover / title, a pet or a friend’s pet, doing a hobby like painting (you don’t have to be good at it), comic books, musical instrument, D&D manual, playing dominos…whatever! If someone wants to chat, just give them a small natural conversation starter and frequently look up from it, take breaks, smile; so they know it’s ok to interrupt you. If someone shows interest by a prolonged or repeated glance, just smile and say, “Hey are you into ‘whatever’ too?”