playdate etiquette

kate has a playdate this morning with a little girl from her class. i don't know her mom really well - just in that chatting-in-the-halls-when-we-drop-off-and-pick-up sort of way. but she's a very nice woman and kate adores her little girl. so the mom invited kate over for a playdate this morning and kate is so excited. but me? i'm a little confused. i'm not sure if i'm supposed to drop kate off and come back to pick her up or if jack and i are supposed to hang out at her house while the girls play.

yes, i know i could just ask. but i feel stupid for not knowing. i feel like either way is an imposition: either i'm asking to dump my kid off at her house while i run errands or i'm asking to hang out at her house when she could be doing things she needs to do.

i'm totally clueless. there are few things i like less than feeling clueless and not knowing the rules.

**UPDATE: i talked to the mom and told her i felt dumb but i wasn't sure what i was supposed to do. she was so nice and said she had just planned on me dropping off kate. phew. over and done with. (but i still feel dumb) :)