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offer to be a roadie and help set up equipment, or put up the posters or sell tickets. Be sure to do it for free; it will get you free access to the gig anyway and they will owe you a favour. Make sure you keep a good relationship with them.
Talk to bands and organizers at local gigs and stay in contact with them. Offer to help on gigs that they are organizing; e.g. Once you have been to a couple of gigs you should have met at least 5 bands or artists.