2 Alternatives to Sikr
Gary Fung- Creator of isoHunt & WonderSwipeConvenience. There's no point to Eventbrite anymore, when they neither have Facebook's user or well designed invitation flow.
Lorenzo Fiori- Marketing&SM Manager at NanosystemsThe way you can integrate it with your social activity is amazing
Rating and price
Chris Messina- Product designer & entrepreneurDepending on what you're into (i.e. partying, clubbing, etc), this can be a useful way to find a local crowd to hang with.