Organisers hope that The High Horse Break the Stigma Showing Festival will be able to go-ahead on July 11 as Covid restrictions are lifted.
Money raised from the event will go towards the mental health charity Riders Minds.
But sponsors are needed to help pay for ribbons for rosettes, sashes and for prizes.
Organiser Carolle Lee-Jones, aged 50, from Bridgnorth, has now issued an appeal for people willing to sponsor the event to come forward.
She said: "We are hoping the event will be a huge success.
“Many people have struggled with mental health issues during the lockdowns and I had friends who tragically lost their personal battles.
“That is why I decided to organise a fundraising event in aid of Riders Minds, which provides a much-needed lifeline.
"We would be hugely grateful if local people and businesses could get behind the event and offer their support."
Carolle added: “Riders Minds was founded in 2019 by top event rider Matthew Wright and his wife, Victoria.
"Matthew was very open about his own mental health issues and he sadly died earlier this year.
“The charity aims to provide guidance, support and help via an extensive, user-friendly online mental health and well-being resource.
"The show will incorporate a range of showing classes, plus show-jumping and a Working Hunter class."
Sge added "Judges give their time for free but we have to hire the showground and pay for first aid and we have previously held events at Gracelands in Worcester which have been attended by 300 to 400 people.
"We need sponsorship of about £800 to cover our costs and hope to raise £2,000 to £3,000 for the charity.
"Class sponsorship is £20 and anyone keen to sponsor the event can call 07949 005001 or find further information through the firstname.lastname@example.org email address or through the Facebook page."
Report by Sue Smith