The best alternatives to Eventifier are DSM Website Plugins, Shryne, and SamSaidYes. If these 3 options don't work for you, we've listed a few more alternatives below.
What do you think of Eventifier?
AssemblyAI— Speech-to-Text API with superhuman accuracy
You can finally see all photos and videos of your guests - live! No more annoying photo hunting - it has never been easier. SamSaidYes simplifies sharing photos among all mobile phones at your party in a smart way without registrations.
SnapSpaces allows event hosts to customize and host their own web page for crowdsourcing photos from their guests (Weddings, etc.). Each site includes 250 cards (3.5"x2.5") that match your theme, and are mailed to you directly for distribution at your event.