Changing Calendar default organizer account

I have 4 gmail accounts in Thunderbird. The calendar shows items from all 4 accounts. My issue comes when setting up an invitation. Pretend my accounts are: personal1@gmail.com personal2@gmail.com personal3@gmail.com business1@gmail.com If I want to set up a meeting with invitations from business1@gmail.com, I select the account from the left side of the calendar list, then I create a new event on the day I want. The dialogue box correctly shows "business1@gmail.com in the Calendar drop down box at the top. I can then fill in title, location, category, time etc. But when I click on Invite Attendees, thunderbird has already added "personal1@gmail.com" as the first attendee and is waiting for me to enter the contact of the second attendee. If I add people and send it out, it goes from my "personal1" account and not my "business1" account and any replies come into "persoanl1". Same thing happens if I start by selecting the "personal2" or "personal3" accounts first in Calendar view. It always sets "personal1" as the organizer. I can not figure out why Thunderbird is automatically using "personal1" as a default and sending from there. I am adding a screen shot to show what it looks like after adding an invitee.