I too have been looking forward to learning more for the day I will open my tea room. Here is a few of the things I found while just using ggogle to find more. Type in "tea seminars" There is lots listed there.
I am in NE and have not found much here. It seems that there are a few opportunites in California though.
Check out Lady Dawnya's site at www.teaevents.com or Lady Grace at www.teagraces.com.
Lady Dawnya offers on-line seminars on various subject regarding tea for a reasonable price and Lady Grace is in Cali!
Hope this info is not too late.