Why make it complicated?
"Hey, thanks for sending me your number, I'm free to join you for the game, when and where do we meet up?"
But I really don't get why, as shown in this thread, women almost desperately crave to be asked out rather than asking out. What's the big difference? Do you long for the feeling that you're wanted or something? And in either way, even if you established contact he's the one who had an event organized, so what's the big deal?
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Women...