Assuming you upgraded your Galaxy 5 to Android 2.2, you can do the following:
- To sync and see calendars from both accounts:
a. If you already added your other GMail account, skip to step c.
b. Add your second GMail account under
Menu -> Settings -> Accounts & sync -> Add account -> Google and follow directions there.
c. Tap on the newly added account and make sure the "Sync Calendar" option is selected and exit out of Settings.
d. Open up the Calendar app and go to
Menu -> More -> Calendars expand the newly added Google account, which should show you all of its available calendars. Keep tapping the button to the right of each calendar until both icons are enabled, and the text under the account name reads "synced, visible", and tap the OK button.
e. You should now be able to view the second calendar's entries in the Calendar app (or any app that accesses Google calendars.)
- Any events you create on your phone via the Calendar app and assign to a GMail account will automatically sync to your online GMail account.
- Instructions for sharing your Google Calendar with a friend can be found here.