The open-house reception runs on arithmetic, and most of the inputs are yours. Invitations here usually go out without RSVPs, and there is no reliable Utah County figure for how many invited guests come, so this planner does not pretend to have one. It asks for your own estimate, then does the sums our open-house reception guide walks through: the line, the window, the room and the cake. The fields start filled with that guide's worked example so you can see how it moves; replace them with your own.
How each step works
One event or two
The two-event day, a seated luncheon for the people who were in the sealing room and an evening reception for everyone else, is a custom, not a rule. Our guide to the luncheon versus the reception reduces the choice to one comparison: the sealing list against the full list. Many times bigger means two events; about twice means either works; nearly the same means one event can do both jobs. The planner reads "many times" as three or more and "nearly the same" as less than one and a half, and tells you which side of those lines you are on. Two questions settle most ties: whether many guests are traveling (a single event at a predictable time is kinder) and whether someone in the family wants to host a luncheon (let them).
The line
Households, not individuals, because families come through the line together. Multiply households by the seconds each spends with the couple and you have the line time if the couple stood there all evening. The open-house guide's own example: 250 households at about 40 seconds is 10,000 seconds, a little under three hours, so a 2.5-hour window means a line most of the time and a 3-hour window gives it room. To speed the line without being rude, keep fewer people standing in it, put the guest book after it, and have a parent move it along when it bunches.
The room
An open house never has every guest in the room at once, which is why venues here quote two capacities: one seated, one "flowing" or "open-flow" for a come-and-go reception. The planner estimates the average number in the room as people attending, times minutes each stays, divided by the window. The open-house guide says twenty minutes is a normal stay. The guide also notes that some guests always arrive on the minute, so treat the average as a floor, not a ceiling, and compare it against the venue's flowing number. Capacities shown are each venue's own figures as our venue profiles report them; our reception centers by city list covers more venues.
The cake
Servings are people attending times the share who take cake. Our wedding cakes guide notes that bakers and planners often size for 75 to 100 percent of guests depending on what else is on the dessert table. The local habit for a big open house is a small decorated cutting cake for the photos plus sheet cakes in the kitchen, cut out of sight. Give your baker the serving count and the reception style and let them size the cakes. The other refreshments have to last the whole window, so plan refills in batches and give one person the job of watching the table.
Related tools and guides
The wedding date finder checks a date against temple closures, conference and BYU games, and the sealing-day planner builds the day's timeline from your appointment. For where the reception happens, start with Utah Valley wedding venues, and for the costs, getting married in Utah Valley on a budget.
These are worked estimates from your inputs, not predictions. Venue capacities are as each venue published them when our profiles were written; confirm the figure for your room and layout with the venue. Tell us if a number here has changed.