As regards the ALAAF thing, using Wiki ( Google Translate ) and battling through the Google translation, I get the impression is that the badge is for the Rheinland district of a "Guild of Jesters"*, for whom the recognition call is "Alaaf" - much in the same way as the Home Guard would call "Hi-de-hi" and respond "Ho-di-ho" (well in advance of the TV holiday camp comedy).
*That's my take on the translation, it could be "Company of Fools" or any similar phrase.
During a school exchange visit in 1973, the local town, Altshausen, had its carnival parade. One souvenir I still have of it is a plastic cameo of a jester, this character being the focal point of the parade and presumably a member of the Guild of Jesters.
The local tradition of the Swabian-Alemanniccarnival called Fasnet can be traced back to 1348. At that time "town-hall dances" were reported, celebrating the end of a pestepidemy.
Every year, the Fasnet season starts with the Gumpige Dunnschdig (Jumpy Thursday) a week before Ash Wednesday. In the evening, the Hemedglonkerumzug (from "hemed" = nightgown in local dialect) takes place, so everybody runs through the streets in pyjamas or nightshirts. This custom symbolizes the awakening of carnival fools.
The main pageant takes place at Sunday. Typical carnival characters of Weingarten are the Plätzler (in a red and white costume, first depicted in 186, the Lauratal ghosts and the Bockstallnarren ("buck stable fools"). In addition to these local groups, many other carnival groups from the region take part in the pageant.