There are some reasons:
1) We book tickets for guided visits to the museums on our tours, we need to know excat number of the participants
2) The size of groups are small. If a group of friends, colleaugues, families book tours and they have enough people to fill the group, we cannot add 2-3 more people to such groups. We form a new group.
2) If there is no booking at all at some days (low seasons) a tour guide won't come to the meeting place. Although we run tours even for 1 person, if booked in advance. Please, book in advance.
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