If a company runs a service as "one who arranges, holds, and executes planned events", what's the term of it? "Events executor" seems a rather grim name, "Events arranger" seems lack of fume because what the company does is more than just arrange for the event. They basically oversee the whole thing from the start (planning) to the end (cleaning up and deliver the certificates if any).
You're talking about an event manager or event planner.
From Wikipedia's article on event management (redirected from event planner):
The process of planning and coordinating the event is usually referred to as event planning and which can include budgeting, scheduling, site selection, acquiring necessary permits, coordinating transportation and parking, arranging for speakers or entertainers, arranging decor, event security, catering, coordinating with third party vendors, and emergency plans. Each event is different in its nature so process of planning & execution of each event differs on basis of type of event.
The event manager is the person who plans and executes the event, taking responsibility for the creative, technical, and logistical elements. This includes overall event design, brand building, marketing and communication strategy, audio-visual production, script writing, logistics, budgeting, negotiation, and client service.
From "Becoming an Event Planner" at The Balance Small Business:
The event planner creates programs that address the purpose, message or impression that their organization or client is trying to communicate. Event planners work long and non-traditional hours to plan and execute all details related to a variety of meeting formats including seminars, conferences, trade shows, executive retreats, incentive programs, golf events, conventions, and other programs.
Interesting question. I am a native English speaker and I come across situations like this all of the time; they are very common! There is no one correct way to answer this, but here I would probably use “event organizer.” However, if this term still seems too vague, adding additional context can help the reader understand what kind of service you are referring to.
What exactly does an event coordinator do? Day-to-day duties often depend on where an event coordinator works and what needs to get done. In general, an event coordinator puts together events, tackling anything from client meetings to cleanup. Responsibilities may include preparing budgets, scouting and booking locations, conducting press outreach, lining up sponsors and celebrity guests, and securing food and drinks.
Another alternative is to use event host. Hosting differs from event organizing or planning, in that it stresses that they provide the location and are responsible for the party. It is not 100% precise which sense it refers to though (these correspond to 1b and 1a in the definition below). You would likely want to combine it with planning or organizing, as in:
We can organize and host events of up to 200 people.
The applicable definitions of host from Merriam-Webster:
host noun (2)
1a : one that receives or entertains guests socially, commercially, or officially
1b : one that provides facilities for an event or function
host verb (2) hosted; hosting; hosts
1 : to receive or entertain guests at or for
: to serve as host (see host entry 3 sense 1a)