Hull Folk and Maritime festival starts tonight and continues through Saturday and Sunday. Nearly all the events are free and
" The 3 days of the 2016 Hull Folk and Maritime Festival, sees more than 100 acts performing over 13 stages throughout the Hull Old Town and Marina area. "

On Saturday there are events to commemorate the start of the Spanish Civil war, with Na Mara doing a free gig tonight at the Minerva pub at 9.00 PM. The Wilsons are on at about the same time in Kardomah94 but that is one of the few events requiring payment.
There are plenty of singarounds and music sessions dotted through the weekend as well. There are even events which involve a river trip on the Humber Keel, Evangeline.
" " Floating Poetry Marathon ... Join some of the region's best writers aboard the Humber Keel Evangeline, for a top-notch, long-running literary lyrical extravaganza. Enjoy live readings and original music interludes in a variety of styles and in unique nautical surroundings. The vessel is moored near the Green Bricks pub and there are a limited number of open mic spots available to readers and musicians. Sign up at 12.45pm on the day. "   

Definitely worth a look.
Read all about it here