Re: Follow up to a planned event initial pickup
The idea is to get a girl alone, you don't want her and her friend together at the same time it won't end up being the situation you're looking for. You've already sort of invited her so getting her to go shouldn't be so hard. Text her before to be like "Hey this is blah blah blahs number from Tuesday" or whatever, remember to make it your own and don't use my bland example, be funny, make a reference to something interesting that day, you get the idea. Hopefully you can get a text conversation going, and from there keep it interesting and ask her to join you at the bar on Sunday.
"Act like you're interested, not like you care."