The severity of the event can be lessened with Cephalaxin and/or a lactation massager (specialized waterproof vibrator).
See also WebMD.com's article about Mastitis.
Frequently Asked Questions
About Inducing Lactation
Can I use a TENS Unit to help induce lactation? (warning:NSFW)
Are there health concerns from breastfeeding or letting someone drink my milk?
It's perfectly fine to try another person's breast milk if you know their health history. Breast milk is a body fluid and therefore it's possible to transmit pathogens. The next biggest concern is Mastitis (warning:NSFW) which can be lessened with Lecithin and a proper latch technique. The Piercings and Lactation page (warning:NSFW) addresses this concern as well.