Solution - 1

Did you checked is there any option in wp-admin to enable venue description for mobile devices? Otherwise you have to add custom CSS to show that.

Solution - 2

Hi, Try this css

@media (max-width:481px) {
    .entry-event-list .event-table-cell {
        display: block;
        padding: 0px;
        border-bottom: none;
    }

    span.event-table-cell.event-location {
        min-height: 20px;
        margin-bottom: 0px;
    }
}

Solution - 3

I think this is solved already