We found a cool trick to invite people to the event / landing page.
1) With audisense or buzzsumo, extract twitter handles for certain keywords/regions into a CSV file.
2) Put them in mass-planner and send personalized tweets with the syntax changer.
We did this for 2 months and we got around 500 users just by doing this.
On their side we they think it
s a personal invite but its actually a well executed job by mass planner.
I'm in for the Giveaway