I would advi s e you to announce to your boss [or whoever] that you plan to be married on such-and-such a date and would like to have some time off for that happy occasion (specify a number of days, or ask how many you could take). I really don't think 'attend' is the proper word here. In addition, you will be at your wedding (lasts about 30 minutes), not your marriage (lasts a long time, we hope).
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