Don't want to get you guys hopes up as it's not really from the horse's mouth rather a secondhand account by a fan who attended a convention.
"Emily Bett Rickards is ticklish!! I repeat SHE’S TICKLISH! #HVFFSanJose #EmilyBett"
https://twitter.com/Fearlesslyblack/status/937438263555399680
There was a Arrow panel there, but it seems this incident happened during the meet 'n greet afterwards which I don't think was filmed.
"Emily Bett Rickards is ticklish!! I repeat SHE’S TICKLISH! #HVFFSanJose #EmilyBett"
https://twitter.com/Fearlesslyblack/status/937438263555399680
There was a Arrow panel there, but it seems this incident happened during the meet 'n greet afterwards which I don't think was filmed.