I thought there was a smaller boat at the last Upton FF as well as the Conway Castle. I would have a word with Richard Hannah and see if there is any way you could use an existing boat trip and buy tickets (?).
PM me if you need an e-mail address. Or go on the website.
There is definitely a register (or it might be a registry there) office in Malvern. Doubt Upton.
Dancing? Just give me the nod & I will pick up the beat!

errrr Tweeksburg - not.
Open: Tuesday and Thursday from 9.30am to 12.30am (by appointment only). There is no facility for ceremonies at Tewkesbury Borough Council Offices. but:
Worcestershire Register Offices try Worcester, Pershore or Malvern.