To estimate the amount of participants, please register yourself here in the wiki. Mention explicitly if you intend to come and bring some keyboards to show or sell.
Come, see and discover keyboards, meet and discuss with other enthusiasts, and try and test hot new (or old) stuff! Don't be shy and bring as many keyboards as you wish to show them to others. If you don't have any, no problem, you're more than welcome to attend the meetup. This will also be a good time to sell this board you will never use or purchase this keycap set you're dreaming of.