The below link is provided by the NHS and gives a list of Vaccination Drop-In sessions at numerous locations throughout the county.
https://covid19.glos.nhs.uk/vaccinations/#link-dropin
Please click on the link to find the nearest location to you and the vaccinations on offer and who can attend etc.
The list is continually being updated by the NHS as and when new sessions have been organised so please check on a daily basis if you are trying to find one near to you at a time to suit you.