Opening days are pretty much common place here. Some go big and others not.
The idea is you want people to notice you so for a few hours you take over the street, or well the pavement. It’s not actually a whole day, just a few hours, usually 7-11 here, in the afternoon but it’s sort of a party kind of thing. You need music, not the usual relaxing salon type though, but mainstream. And perhaps a few tables on the street for people to be able to stay and chat when you are not available. Invite other local businesses and inform them about it so you don’t have a problem. Don’t do any treatments that day, as that will take too much of your time on a single person. Instead go around and chat a lot. You want people to get to know you. Be informative, give out flyers, the raffle idea is good. 10% is also good.
Another idea is when they pick their ticket for the ruffle then it goes along with a ticket for a small treatment for them. So say they pick number 25 and they earn a 5 min foot massage with it, regardless if they win or not. Food and drinks are a must. Not just fizzy drinks. What adults usually drink, lots of bear, some alcohol some wine. Some people hire djs and catering services but I guess it would sound strange to your ear.
Just think of it as a party and you can’t go wrong.
Oh and spread out some flyers and posters regarding this opening day party a few days before. It will attract some new people this way.