[coryl]

I'm not sure how all the things your described aren't solved by a simple email or web page listing.

I'm not sure if goblabble can make money, it depends what people use it for.

[anigbrowl]

Not everyone uses smartphones, not all events details are announced so far in advance they can be printed up at home. For that matter not all people have printers.. Especially for the under-30 set, people may leave home long before selecting their final destination of the evening.

[techbio]

More people have phone lines than cell phones. More people have cell phones with them than an internet connection. Etc.

The recording ID is easy to text message. Almost certainly spikey traffic.