http://www.meetup.com/dynlangchile/ https://www.startupdigest.com/digests/chile (email carlos - he's the kind of guy who's always happy to chat to anyone!) http://stgomakerspace.com/
they're all kind of nerdy, but once you know people you can branch out...
if you're already into something, like climbing or mountain biking, or skiing, i bet there are groups you can join. i went mountain biking a couple of times out east and met people just because we were getting injured together... or how about the local music scene? you could try going to concerts (look in la tercera or el ciudadano or the clinic something). there are courses at cine hoyts la reina (easy to get to on metro) where you go watch films and chat about them (my partner just signed up for one, but she's taken and probably twice your age anyway). the craze last summer (i think, maybe the year before - i am old and out of touch) was doing circus tricks. you could pay to learn. seemed like a way to meet people. or dancing lessons. do you play football? many people here play once a week for fun - try your local sports centre and see if they have a noticeboard.
what nationality / colour are you? if you're white here, getting a date should not be so hard! don't any co-workers have sisters? if you don't speak spanish well, offer english lessons to cute natives (how can that possibly fail? just stick some fliers up... you can even get paid at the same time! this is such a good idea i want to be single again)
oh, and get invited to a barbecue on the 18th. you must work with some chileans? i'd guess someone would be happy to invite you to a barbecue. you can meet people there. everyone will be at a barbecue that day.
or if violence is more your thing, well, a week before...
another idea - get involved with the elections. i bet they're looking for volunteers.