One downside of using the bootstrap way can be that it doesn't remember the active slide if i'm right. Have to test it to be sure. If it's not remembered then maybe it can be usefull to create a custom js-file for it. Hmm, will test it out
As expected the Accordion slide is not remembered but that can be fixed, did create a js file for JEM3 (a while back) so yep that one can be used. So let's try it.
../administrator/components/com_jem/views/events/view.html.php
EDIT of jojo12: if I am right it's
../administrator/components/com_jem/views/event/view.html.php
Add this line
// Load scripts
JHtml::_('jquery.framework');
JHtml::_('script', 'com_jem/slider-state.js', false, true);
so it will be like
...................................................
// Load scripts
JHtml::_('jquery.framework');
JHtml::_('script', 'com_jem/slider-state.js', false, true);
JHtml::_('script', 'com_jem/attachments.js', false, true);
.............
Doing so it will search for a file called slider-state.js, that file doesn't exists (yet) so you need to create it.
Go to folder: .../media/com_jem/js/ and add the attached js file to the folder