Purim on Motza'ei Shabbat

Question: What are the special Halachot when Purim falls after Shabbat?
Answer:
1. Bringing the Megillah to Shul on Shabbat: We do not read the Megillah when Purim falls on Shabbat (though nowadays only Shushan Purim can fall on Shabbat). This was decreed in order to prevent one carrying it into a public domain (which is forbidden on Shabbat). There are later authorities (i.e. Aruch Ha-Shulchan Orach Chaim 693:3) who forbid carrying the Megillah on Shabbat on account of it being Muktzeh (something that may not be moved on Shabbat), but most authorities disagree and permit it (Shulchan Aruch Orach Chaim 688 and Mishnah Berurah #18). Bringing it to Shul is permissible all the more so on a regular Shabbat (i.e. which is not Purim). There is, however, a problem of bringing the Megillah to Shul on Shabbat because of the prohibition of preparing on Shabbat for a weekday. If one does bring the Megillah to Shul on Shabbat, one should be sure to learn something from it at Shul on Shabbat itself.

2. Children Dressing in Purim Costumes on Shabbat: Children may dress up in a costume on Shabbat before they come to Shul, since they will have enjoyment from the costume on Shabbat itself. It is therefore not considered as if one were preparing on Shabbat for a weekday. This is obviously on the condition that there is no part of the costume which is Muktzeh, and it does not involve painting, [forbidden] tying, and other similarly forbidden things.

3. Noisemakers on Shabbat: Noisemakers are definitely forbidden on account of Muktzeh. And even if they are not Muktzeh, it is impossible to bring them because of preparing on Shabbat for a weekday, since it is not possible to rely on the solution of using them on Shabbat itself, since one may not make noise from any type of instrument, objects, etc. on Shabbat.

Summary: It is permissible to bring a Megillah to Shul while it is still daytime on Shabbat provided that one learns something from it. It is permissible for children to dress up in a costume while it is still day time, but it is forbidden to bring noisemakers.