Sgardener, welcome!
Am pretty sure someone will have oriental poppies for you, as we had in the past. I am so glad you thinking of coming and meeting in person, sure am biased but it is a lot of fun event!
As seedrat mentioned our swap is rather give and take event which does not have 1 to 1 trading section, we just never found it working. Glad that is clarified, am betting you will be surprised and find a ton of plants you did not know you needed! LOL