Hello,
I am interested in Flash Parties for /e/OS !
I definitely am interested in having goodies or flyers or any other communication material to make our meeting more visible on-site ! Someone talked about t-shirts or was it hoodies ? 
Next meetup is planned for next week, so it may be short to communicate widely about /e/OS flashing party.
I believe also to be cristal clear with people attending to avoid bad first experiences and dataloss as they discover /e/OS.
This is something LUG are familiar with as similar situation shall be overcome when first Linux installation is done on a laptop or PC, here is French “unliability document” used by Guilde: time to update “computer” with “any electronic device” 
.
As a sidenote, idea came on French post about Flashing Parties to have a map . So that, I started that on eOS Flashing Parties - uMap
(Do not hesitate to indicate if it has to be changed, updated, removed, it is just a “first draft” map.)
HTH,
Low Memory