Thank you for your reply.
Yes, both my teacher and host family knows that I am coming and they would like to get together. I am just sending this e-mail to let them know the dates, and of course, to ask if I can call them when I get there to see what time would be good for them, where can they meet, etc. Will just,
"Nihon ni iru aida ni/wa, denwa wo kakete mo yoi desuka ? " Be fine by itself? Do I use niwa, or either one of the particles? And, would it be better to say odenwa rather than denwa?
Thanks again for any help you can give