I've tried to use lanyrd in the past and have found its information to be unreliable and also difficult to find what I'm looking for, e.g., "what Ruby conferences in the US are coming up next year worth attending/speaking at?"

Keeping conference information up to date requires continuous attention and it doesn't look like it's been getting much lately.

Which from what I've heard is sadly more or less dead (requests that require human attention are not processed, long downtimes)