There is no limit however in order to keep your event page running smoothly for all your customers we suggest no more than 3.
There is no limit on the amount of widgets on one page.
There is no limit on the amount of tracking links you can create.
The sequential tracking number will always be at the top of each ticket. This number is sequential across all ticket stock ordered for each event. If you order 500 tickets then 2 weeks later order another 1000 tickets, the second order will start at 501.