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Birthday balloons. Balloons are fun at any party, whether a christening, a wedding or Halloween party. Always great to add some quick and easy decoration to brighten a party. Best of all, come in a variety of styles. If you head down to your local party store should be able to buy some balloons that are relevant to a birthday party.
birthday invitations. While many people tend to just send the invitations by email these days, invitations cards have a little class. Consider buying some specially designed 50th birthday party invitations and send them to their friends. You should be able to find a variety of styles, but if you can not find one to your needs, try making your own. You can print some to use the computer, or do a bit of paper and other decorations using enough age 50.