The NHS urgently needs people to give blood.
Session dates will be held on July 8 in Stanmore and Edgware.
Times are from 8.55am to 12pm and 1.30pm to 4.35pm.
They will be held at the KSMIC of London Hussieni Islamic Centre, in Wood Lane, Stanmore.
Another session will be held at Westgate House, Edgware Community Hospital.
Patients with B-negative and O-negative blood are being asked to come forward.
Book appointments in advance on 0300 123 23 23.
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