Monday wedding

If people are not able to attend your wedding because it's on a Monday, it doesn't necessarily mean that they don't care about you. They may not be able to take time off work at that point (I've worked a couple of jobs where no one was allowed annual leave during specific busy periods). Also, bear in mind that if you are having a traditional wedding that goes on until late, people may have to book two days off work instead of one, especially if they live a long way from your wedding venue.

I'm definitely not anti-midweek weddings (we got married on a Thursday!) but it is a case of 'know your crowd'. Most of our guests were self-employed or retired, and many of those who were working were in jobs that were busier at weekends, so a midweek wedding was easy/as easy for all but a couple of our guests. If the majority of your invitees work traditional Monday-Friday jobs, then having a midweek wedding is more likely to impact the number of people who can accept. In your place, I would check that key guests are able to manage a Monday wedding, and as long as they can, go ahead with the understanding that you may have a higher-than-usual number of people decline.