We could take the season into consider. For example, if it's snowy and around Christmas, there could be some celebration going on that both of them end up attending thanks to parents or friends or school. Or if it's summer and sunny out, there could be a sort of potluck picnic going on, maybe if they're in the same neighbor or area, they could meet that way. Or if we did want to go with a real club, they may be more keen would be something to do with gaming be it cards or something handheld since it could tie into them getting more interested in games in the future.