How to propose hangouts with the opposite gender without sounding like a date?

There's a girl (~20F) at choir I (20M) have a squish with (a nonromantic-crush). But I find it hard to suggest a hangout, like grabbing coffee, without sounding like I want to date her. The choir also only meets once a week and ends at 10pm, so we can't do anything right after. What should I do?