Set aside at least an hour every week when you will be available to talk to the parents of your students. This will allow parents to make appointments and help avoid rushed conversations after and before classes.
Conduct any meetings with parents in a room free of other people in order to ensure privacy. At the very least conduct your conversation out of earshot of other parents and students. There is, however, generally no need to exclude the student himself from the meeting.
Speak carefully because parents of ESL students may not speak fluent English. Slow down your speech and avoid idioms as well as colloquial language. In addition, avoid using language specific to language teaching that will mean little to those outside the profession.
Use any interpreter your school can provide should the parents speak very little English. Alternatively, encourage parents to bring a bilingual friend or member of their family to meetings. If none of these options is available, then their child may translate.
Bring examples of their child's work to any meetings with parents. Showing them an example of their child's writing or a recent exam can both help show a child's progress and reassure parents that their child is working hard in class.
Write regular reports on your students' progress. Parents will thus know how their child is progressing before they meet with you. This will prepare parents for those, hopefully rare, occasions when you have to report negative behavior in the classroom. It will also give you more time to answer any queries they have.
Temper any unrealistic expectations parents have about how fast their child should be progressing. Impress upon parents that learning another language is a task that takes months, or even years, and that all students of English progress at different speeds.