According to PayScale.com, the average nurse salary today is somewhere between $38,000 and $78,000 per year ($20- $37 per hour with $26 being the average). There can be huge differences in pay from place to place. There are several things that will affect this base rate of pay in your nurse salary. Some of these are:
Ideally, wedding invitations should be sent 8 weeks in advance. You should ask for people to RSVP no later than 3 weeks before your wedding. Way too early. I wouldn't sent them out till 6-8 weeks before the wedding. I'd send them out in about Mid-May. Only because people are going out of town during the summer.
Get organized about a month before your desired invitation send-out date. This should be six to eight weeks before the wedding, allowing your guests adequate time to respond and ensuring that you will get a reliable head count a week or two before the event.