This applies only to girls you have built enough comfort with. If you got a girl's number in 2 minutes at a club, she will not show up to the date. You need to build comfort with the girl after attraction and after qualifying her (for example asking her "So what makes you special?"). Comfort is key for going on a date (aka Day 2).
Comfort can be built through phone conversations or text messaging. Or it can be built in the club after attraction is built. Don't just get the number and leave, hang out afterwards maybe even go grab a bite of pizza after the club.
Now to asking her out...
"Hey tonight I'm going to Robson St to buy a new blazer, your going to come and help me pick one out."
You don't leave room for a "no" response. And it makes it casual. It doesn't make the date about her (i.e. coffee or dinner date). Obvoiusly your not going to buy a blazer, your just looking! And while looking, your hanging out with her in a "happening" part of the city which has stores and is close to other venues such as Starbucks, stores, Subways, Chapters etc etc. So as your browsing for clothes with her, and being teasing and playful as usual, you walk by a Starbucks... "Lets grab a coffee I really need it." Or "Hey I got to buy this book quick let's hit up Chapters." Or "Lets grab a bite, I'm hungry."
It works. The main thing here is that it makes the date casual so there isn't pressure on her, and you. And it reduces the probability of her saying "no" exponentially, but this depends on your game and how much comfort you've built with her before "asking her out".