This plugin allows you to add RSVP and guestlist functionality. Guests can leave custom messages for the planners. Uses Google Docs spreadsheets.
Check the homepage for a lot of comments and responses about how to fiddle with this plugin, we have had a bit of discussion and help from other users.
Note that you are required to have PHP version 5. Sorry, the only solution right now is to use that version of PHP.
If you cannot change the text in the options page, you can change it in the source code (by editting wp-gdrsvp-plugin.php). This is not a very safe thing to do, but you could search the code for the words you want to change and fiddle around with it. This take familiarity with HTML and a little PHP.
Copyright (C) 2008-2014 Gifford Cheung, Brian Watanabe, Chongsun Ahn
This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any later version.
This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.
You should have received a copy of the GNU General Public License along with this program. If not, see http://www.gnu.org/licenses/.