The two towers are a representation of the so called "red peaks", the remains of the church of the Augustine Order, dedicated to Our Ladies on the mount of Altenburg. Today only those two towers exist, being a local landmark. The four symbols below refer to Skat, a card game devised in Altenburg around 1810. They are symbolising the German-suited packs (acorns, leaves, hearts and bells). Most people use however French packs (clubs, spades, hearts and diamonds).
Sources: Source: here, in German only, and here Klaus-Michael Schneider
Joint Meetings
Two of the meetings were together with foreign vexillological organisations:
The one at Münster (1997) together with the Dutch NVvV, the one at Ústí nad Labem together with the Czech VK.
For these joint meetings there existed also special flags:
Flag of the German-Dutch Joint Meeting by M. Schmöger
The one for the German-Dutch meeting joining together the German and Dutch national flags with the knot in white and orange colour.
Flag of the German-Czech Joint Meeting by M. Schmöger
The one for the Czech-German meeting joining together the Czech national flag and the DGF flag, with a blue lozenge (fimbriated yellow) with a yellow knot in the centre.
M. Schmöger, 28-29 October 2002