Hello Rebekka im Alex

I wont't do this as a correction since I'm not native to Japanese, but as far as I've learned you need to use the te-form to do compound sentences like that, instead of と, since that only means "and" when you are doing a list of items (A and B and C and D). So I would write: しゅうまつに家で日本語をべんきょうして、カタリナさんとえいがをみて、お姉さんに行って、日本語の音楽を聞きました。 The tense (in this case past tense) is denoted by the final conjugation. Also I've used に for the particle after しゅうまつ and switched around えいが and カタリナさんと. Hope this is right and hope it helps!