It might not be easy to open the bank account. And it is unlikely that a bank will open an account in your own name for this purpose.
You have made no mention of how your fundraiser will be structured. Will it be registered? Will it be a registered charity? Will it have a committee? Will the funds be held in a trust? etc. etc. All of these issues will have to be addressed before approaching a bank.
When all of this has been done, there are issues about how the funds will get into the account. Many fundraisers seem to give out a bank account number and a branch name and sort-code, and ask donors to pay into that account. This causes endless problems, as some banks can't handle this. If you do manage to open an account, discuss such things with your bank before proceeding to commence fundraising.