Actually it is not a choice. Evo only allows you to sync ONE account and that is the first email you sign up on the phone. So, if you have multiple email addresses but only one calendar, then you have to sign up on that email first.
I found out that this choice to be able to sync calendars with all google accounts will be released in the 2.2 software but no word when that will come out.

Ok so I jave had my EVO since it came out and it replaced a windows mobile phone that I sync'd with Outlook so all my calendar events are "PC Sync" I have yet to sync with my pc, however, would like to back these up so interested in switching all of these dates from "PC sync" to sync with my google account. Does anyone know how to switch them. I edit the event but there is no option to switch them. Thanks!

thanks of this info it's gonna be usefull for later on

Hi,

there's an app for changing calendar colors, maybe it works for you:
https://market.android.com/search?q=slintes

KR, Marc

Hmmm interesting read. Thanks for the info mate.

I'm just using one calendar, exchange. I recently had to remove and reinstall it. It came back in as yellow! Yuk. Any way to change it? The app mentioned above runs constantly, changing colors after every sync, reading precious battery power.

As previously posted, this app should help you:

https://market.android.com/search?q=slintes

That app appears to change the color continually, constantly working. I think I'm better off removing the account and reinstalling it now that I have also removed the other calendars, since they were taking up the good primary colors.