Vik - we use Marketo for our smaller events (attendance of 100 - 200 people). So far we have been real pleased. There is a minor catch though...in Marketo, there currently is no way to cap registration or to set a registration by deadline. However, we discovered a work around where we can redirect a landing page from our registration landing page, to a waitlist landing page or an event closed landing page. As for event check in, the iPad app was perfect for our events team to check people in, and then once sync'd,it goes straight within Marketo.