how do invite some 老友记 to a party with out hurting the other 老友记 feelings.

你 COULD try to be a bit devious 由 telling the 老友记 that 你 want to stay over your situation and not let the others know about this sleeping over business at all. 或者 你 could tell them all the situation you're in and hope that the ones that aren't sleeping over understand.

It is hard to tell to 老友记 that 你 picked other people over them, but unfortunately 你 did not really have a choice. Maybe if 你 told your mom 你 do not want to hurt your other friends, she would let 你 have an other sleep over in some time and 你 could invite the other 老友记 at that party? If not I would try to explain to them that 你 really wanted them to come to, but your mom did not let 你 invite any 更多 people. 你 could do something else with the 老友记 that can't come, like treating them to a movie 或者 something like that, to make it clear that 你 really like them too.
If the party where all your 老友记 are coming is at the same night of the sleep over, spend some 更多 time during the party with the 老友记 that can not stay. 你 will have plenty of time with the ones that are sleeping there.