Nothing wrong with a bit of shameless self-advertising on Mudcat. It is just a question of how you do it.
Some people use any thread as an excuse to plug themselves (or their loved ones), which I personally find rude and intrusive when it has got nothing to do with the subject of the thread.
Some people are more sensitive, but still mention their gigs as often as they can slip in a reference which does not detract from the thread.
Other people start disguised threads, which turn out to be self promotion once you actually read them.
My preference is for an up-front "We are advertising a gig (or tour)" Thread. If you look back through the forum ( do a search for "Punch the Horse" ) you will find many "GIG" threads. Perhaps the most common are ones for Hull band Punch the Horse, who do a lot of pub gigs. When PTH threads first appeared, there were vast numbers of them due to enthusiastic fans or band members (I can't recall which) starting a new thread for each individual event. This did produce complaints about Mudcat being swamped with them.
The question was resolved by an agreement that there would be a new PTH thread each month giving performance details and other siliness. At the end of the month, a new thread starts and the old ones are left to sink into the muddy waters at the bottom of the Mudcat pond. This reduced the number of new PTH threads to 2 a year.

Of course - You could CLICK HERE for a long standing What's On Where thread.

By the way, you haven't mentioned what band your boyfriend is in. You won't get ANY publicity if you don't mention it.
Of course, should you use Mudcat for listing performances, it would be good manners to sign up as a proper member and tell us something about you. It doesn't cost anything, and you can be as cryptic as you wish, but you will find a bunch of nice folk within these doors.

Quack!
Geoff the Duck.