How important is the 6 week PP appointment?

Marlisa • I'm 31 years old & married. My husband and I had one miscarriage in 2008 and then had our daughter June 2009 and our son October 2016.
I'll be 6 weeks postpartum tomorrow. I had my 6 week PP appointment scheduled for Wednesday but had to reschedule do to a funeral. Now my appointment isn't until the 22nd. I'm just wondering how important the appointment is and what is even done at the appointment? Kind of frustrated with how far out my appointment is now, but I can't help that I need to go to a funeral, just wondering if the appointment is even necessary.