Mt. Cuba is hosting a trillium symposium in April. It is three full days and should be a great conference. Check out the schedule.
Here is a link that might be useful: Trillium symposium
Should be a very educational session. See several familiar names among the speakers. I encourage anyone that has an interest in Trilliums, to attend, if you can. The cost is very reasonable and a trip to Mt. Cuba and Winterthur is a horticultural treat. Stay an extra day and visit Longwood Gardens, if you haven't been there. It's only a few minutes away.