Conference organizers for Botany 2019 (Tucson, AZ) are accepting proposals for workshops until December 29th, 2018.
Workshops are most frequently given on Sunday before the formal start of the conference (with the Plenary Sunday evening) and are either a half- or a full-day. If you want more information, contact Johanne Stogran (Johanne@botany.org).
https://mailchi.mp/botany.org/submit-a-workshop-for-botany-1522837