Combine multiple people in one single travel calendar

Dear all, I have been trying to create a travel calendar for the office that shows the travel dates of each team member throughout the year. I am using a template from office which allows me to select each team member from a drop-down list to see their dates. However, I would like to either combine the travel information on one single calendar or create a new category called "All Staff" that would combine the travel information from all the colleagues. Can someone have a look at my attachment and help me with that? If someone has another suggestion of group travel calendar, for instance, using a color code for each team member, that would be very helpful!

Thanks

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Thanks, Logit, that's really helpful!

Glad to assist.