Wonosoban lingo just like other Javanese [central] lingo. The differences just about several words and not as soft as truely Jogjakartan or Solo style. A bit ngoko and madya [not high Javanese lingo type]. For me, it's easy. Just need to 'accelerate' several words into Wonosoban and added with local accent. For example, sometimes they add the word 'kiye' than 'kae' [this, or this is], de'e than kowe [you for people at the same age]. And ngapunten [I dunno] for the normal Javanese 'mboten mangertos'.
Harvest and national holidays on Wonosobo and several small town around like Parakan, Temanggung, Paponan, Diwek, Mergowati and Sukorejo means a festival. They will arrange an occasion in the heart of the city, so called alun-alun [city square] or in one of the villages and nanggap [Javanese lingo for special request] several traditional dances, like Lengger Dance and Jaran Kepang Dance.
Whenever you are there in occasion, smile and pay respect, say greetings and try to offer your ciggy :) Bow a bit whenever you say "hello". If one of the dancers moving around the spectators with a hat or baseball cap open, you can give several bucks into it.