I'm in a precarious situation here, and reading the etiquette forums has my stomach in knots now. 
I live in Alabama and will be getting married in Tennessee in July at my dad's church. Because of the distance between here and where the wedding will be held, my mom and sister are hosting a shower for Tennessee folks (some family, mostly church attendees) and FH's mom and aunt are hosting one here in Alabama for his side of the family and family friends (mostly FMIL's co-workers--I am not 100% certain whether all of them are being invited to the wedding or not).
I work in hospitality (admin assistant for a hotel's Director of F&B) and have become close to some of the hotel restaurant employees over the last few years. Unfortunately, the wedding itself is falling during a busy time of year for the hotel & restaurant, as it is the first weekend of an extended festival that keeps us pretty much completely booked up for about 10 days. Because of my position as an administrative assistant, I am able to take the time off for the wedding during that time, but it will be nearly impossible for most (if any) of the restaurant staff to be able to attend.
I have invited roughly 10 people to the shower being hosted here by FMIL, and everyone that I've talked to seems to be very excited to come. I haven't sent out formal wedding invitations yet, but I did Save the Dates earlier this year. Most of the people who have received shower invites didn't get a Save the Date because I knew the festival above would prevent most of them from being able to attend.
Is it too late to "save face" by sending my shower invitees invitations to the wedding? We're getting those ready to send while I'm up in TN for the first shower (and a week-long family vacation afterward) so they'll go out in the mail 2 months before the wedding itself.