There are many different ways and reasons one would sent a thank you card. Most people would think that thank you cards are only sent for wedding gifts and so on. But you could send thank you cards for birthdays, graduation,weddings, engagement parties etc. There is no limit to sending out thank you cards to people that came for something at your house or where ever.
It is not really hard to find free engagement party invitations. You only have to check out with the best engagement party planning web sites. They are definitely going to know about some of the best deals in town.
You can include anything that you wish like dried flowers that will give earthly scents and make it colorful and accessorize your invitation to give a unique touch for your entire visitors.
You could also consider using a greeting card software. Purchasing the software is going to be cheaper than having the invitations professionally printed. You can also reuse this software for several other occasions. There are some Microsoft Office product like Microsoft Word and Publisher that would also work great for you to create your own engagement party invitations. They have already made designs and the Microsoft clip art can add visual enhancements to your engagement invites.
Document each gift. Chances are you’ll be writing so many thank you notes throughout your engagement and post-wedding that it will be impossible to keep it all straight in your head. So to stay organized, keep separate guest lists for each wedding event (e.g. bridal shower, engagement party, wedding) and document what each guest gives you at the time you receive it.