It says in SA OC Siman 471 in the Rema Sif 3 that it's a mitzvah to take shower/bath and cut ones hair Erev Yom Tov. As well to wear "Bigadim Noim" (nice clothing) "c'mo Shabbos" (like on Shabbos.) ...
Is one allowed to clap one's hands on Shabbos? Does it matter whether one is clapping to a beat or trying to get someone's attention?