How often does DC do events ?

Now what I mean is proper events along the line of what marvel does. Like AvX where the actual event has its own comic and the event has tie in with solo issues and do no say trinity war because that is a crossover not an event.

probably 1 dc event per 6 of marvels

dc has events about every 1 to 3 years.

the better question is how often does dc do reboots

In dc, after cancellation of a title, relaunch of the title is usually a reboot. Stormwatch had a near cancellation and that was enough to cause a reboot too. Simultaneous reboot event is about every 25 years.

Not as often as Marvel.