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First, consider making lists of guests. These can be done by the help of groom, mother of the bride and other closest persons to the bride to help compose a guest list. This idea is to surprise the bride, it is no longer a surprise if you ask help from the bride. To address the party invitation, it should only be sent to those invited guests that are included on the wedding invitation as well.
As for the shower party date, it should fall sometime within two months before the wedding day. And again, to plan for a surprise shower party, planning the date should be unnoticed by the bride as well as the groom to make it more safe. But if it's not a surprise party, you could directly ask the availability of the bride for the party.
If you consider a themed shower party, you should pick appropriate themes that suit the bride's taste. The good thing about themed parties is that you can easily come up with decorations, invitations, party favors and other elements of the celebration. Easy and fast preparation for these elements can be achieved by following the theme of the party such as wine shower, romantic shower, lingerie and more. And obviously, there is a plethora of options for these shower themes to choose from.
Following the theme of the occasion, bridal shower favors and decoration should work coordinately. Literally, decorations, party favors and keepsakes come with tons of choices. A wide variety of these items are available in your nearest local specialty stores. For a wider option, consider browsing the Internet, this way you could be able to widen the scope of favor preference. Each store site offers their specialty favors, from simple to extravagant. You may also find a variety of customized favors that can make memorable personalized party favors. Such items you may consider are place cards, t-shirts, bags, candles and other wedding party favors.