HOW TO WRITE AN INVITATION?
A formal party or event requires printed invitations, which should be mailed four to six weeks in advance. If it is an informal party you can opt for invitations bought from a shop and mailed two weeks in advance. A phone call will suffice for the most casual get-togethers.
Remember that an invitation is the real start to the party, so set the mood. Be adventurous and watch the fun begin early.
1. Names of party hosts or sponsoring organization.
2. Type of event (birthday party, business meeting, etc.)
4. Date. (Alternate (rain date) if any)
6. RSVP (Repondez S'il Vous Plait) date and phone number.
7. Any special dress requirements from black-tie to fancy dress.
8. Be specific about who is invited. There is nothing worse than receiving an invitation and being unsure about who is invited. Include or comment whether it is addressee only, with guest, with spouse, partner, children or bring the whole neighbourhood.
Always send written invitations for formal events such as business gatherings, formal dinners, and special occasions like showers, weddings or events honouring someone. If guests are not from your local area, include a map to location of event. Send anywhere from 8 - 2 weeks in advance depending on formality of occasion. Weddings require the longest lead-time; casual dinners and brunches require the least.
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source: http://www.party-oz.com.au/invitations/, http://www.asianlivetv.com/images/invitation.gif