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Weddings on Purim 
Some Poskim rule it is permitted to get married on Purim. This applies on both the 14th and 15th. Other Poskim however argue that it is forbidden to get married on Purim. However this prohibition refers to the actual Chupa and not the meal, and accordingly one may get married on the 13th and have the meal on the night of the 14th. [However some Poskim rule that this prohibition applies to both the Chupa and the meal and hence one may not have the Chupa on the 13th and then eat the meal on that night, on the 14th.] Practically it is best to suspect for the stringent opinion and have the wedding before Purim. However in a time of need [such as if the wedding will have to be delayed for a long time] one may rely on the lenient opinion and get married on Purim. Nevertheless it is best to have the Purim Seuda take place prior to the Chupa [and have the wedding meal take place at night].
It is best not to arrange a wedding to take place on Purim. However in a time of need one may arrange the Chupa to take place on the 14th after the Purim Seuda and then have the meal later on that night. Likewise one may be lenient to have the Chupa take place on the 13th and the meal take place that night on the 14th.
Is a Chasan and Kallah to fast on Purim if it is the day of their wedding?
No. See Halacha 15!
In Jerusalem on which day are weddings to be avoided?
On the 15th, which is the day Jerusalem celebrates Purim.
By Purim Meshulash on which day are weddings to be avoided?
On Sunday. However on Thursday night, Friday, according to all one may have a wedding take place.
Does one need Panim Chadashos by Sheva Brachos on Purim?
May an engagement party [Vart/Lechaim] take place on Purim?
Yes. One can fulfill his Purim Seuda obligation with this meal if it is taking place during the day of Purim.
 Michaber ibid; Rama ibid; Rashba; Chayeh Adam 154/39; Shaareiy Tzedek 151; Yabia Omer 2/22; and so concludes Birkeiy Yosef 696/12 in name of Yitzchak Cohen which was a student of the Peri Chadash; Shaareiy Teshuvah 696/8 concludes the custom in these countries is like this opinion. M”B 696/28 brings this ruling although he concludes that it is best to have the Chupa towards the end of the 14th and have the Seuda of Purim beforehand. It is recorded that Rav SZ”A got married on the 15th of Adar in Yerushalayim. [Piskeiy Teshuvos 696 footnote 68]
The reason: As the law that prohibits purposely coinciding two celebrations only applies to Chol Hamoed and not to Purim. [Taz 696/4; M”B 696/28]
 Rama ibid
Other Opinions: Some Poskim write that based on Kabala one is not to have a wedding on the 15th. [Chikikeiy Leiv 1/20 in name of Arizal brought in Piskeiy Teshuvos 696 footnote 64]
 M”A 696/18; Peri Chadash 696; Levush 696/8; Ateres Zekeinim 696 based on Teshuvas Mahriy Brin; Orchos Chaim; Kol Bo brought in Darkei Moshe; Ksav Sofer 139 writes the custom is not to get married on Purim; Mahram Shick 345; Aruch Hashulchan 696/12; Meishiv Dvarim 177; Kitzur SH”A 142/9
 The Reason: As it is forbidden to purposely coincide two celebrations. [M”A ibid based on 546]
 M”A ibid; Darkei Moseh 696/5; Kaf Hachaim 696/52
 Mahriy Brin brought in Darkeiy Moshe; Levush 696/8; See Mahram Shick ibid; Kinyan Torah 7/53; The Darkei Moshe ibid and M”A ibid negate this opinion. Kaf Hachaim 696/52 concludes there is no need to suspect for this opinion.
 Minchas Yitzchak 1/39
 Kaf Hachaim 696/51; Kesav Sofer 139; Minchas Yitzchak 1/39; Kinyan Torah 5/84
 Kaf Hachaim 696/51; M”B 696/28 in name of Chemed Moshe; Minchas Yitzchak 1/39; Mahram Shick 345
 Piskeiy Teshuvos 696/12
 Piskeiy Teshuvos 696/12
 Shulchan Gavoa 696/2; Moed Lekol Chai 31/39; Kaf Hachaim 696/54; Minchas Elazar 3 Hashmatos rules even on the 15th one does not require Panim Chadashos.
 Hisorerus Teshuvah 2/120; Taharas Hamayim Shiyurei Taharah Pei 25; Betzeil Hachochmah 2/1 [Safek Brachos Lihakel]. See Piskeiy Teshuvos 696 footnote 69
 Piskeiy Teshuvos 696/13