That is possible. If you have applied for multiple gigs on the same day, you will not be booked for two gigs at the same time. As soon as you are accepted for one gig, your other applications with overlapping times are automatically withdrawn.
Please note: this only works if you have not yet been selected for a gig and the times overlap. Have you already been accepted? Then do not apply for other gigs taking place at the same time.
Example: Isabel applies for three gigs on Wednesday:
Gig 1: 12:00 – 17:00
Gig 2: 14:00 – 17:00
Gig 3: 17:00 – 20:00
She is chosen for Gig 1. Gig 2 is automatically withdrawn because the times overlap. Gig 3 remains active because it starts later. However, this is still inconvenient, as she will never make it to another location by 17:00.
Therefore, check the times carefully before you apply and consider using the 'automatically withdraw application' function.