Timing: mid-July through mid-August tends to work best.
Location: Plan for your hometown, those who have moved away want to see all the changes.
Decorations: nice to have, but don't overspend.
Music: bands can be expensive (and loud), background music works better for people to chat.
Create your Reunion website:
Invite: email first, then send post cards to those that did not respond.
Notify: FEPS of your reunion information, as well as EPHS Alumni Group - Facebook; they can help publicize your reunion.