My husband is going to have questions when he sees I have Tinder on my phone, but he drives a tractor trailer for a living & isn't always around to be my plus one to a wedding :)
In all seriousness, I think this is a great idea and certainly an AWESOME first date (provided it's not a Catholic wedding with a 3 hour ceremony lol). Tinder is helping people find a +1 to a wedding...and maybe a happily ever after if things work out!
It's as easy as entering the wedding info (date, venue, etc) and what you're looking for in a date!