Like most things, isn't it obvious that the answer is 'it depends' and a multitude of answers could be right.
- it could be right to tell the guest that you usually go to CHurch at Xtime and ask if they would like to join you.
- it could be right to not mention Church and decide not to go (and his could involve going to a later service or not)
- it could be right to tell them that you are involved in the service on a rota of some kind and need to go, but they are welcome to join you/stay at home/potter round town.
There is no definitive right answer. It all depends on who the guests are, the circumstances of the visit and day, if any commitments are vital to meet, and both hosts and guests having willingness to be a bit flexible and also friendly.
Some guests would hate to go to church. It's fine to ask them as long as it's clear its their choice. Some guests would love to go and others, well you might not know unless you ask. Some guests are the type that need constant entertainment 24/7 and can't be left behind or to potter for a while, so they either need to go to Churchbor the host needs to not go, whilst others are much more flexible and can be both guests and do their own thing. Some guests might be on a flying visit - the only one for 10 years and every moment to is so precious that choices are made to suspend usual commitments of all kinds. Other hosts have commitments at Church whichbtheybcant avoid - they might be down to preach or to lead a session which no-one else can do and it's really important and most guests will understand about this.
Isn't it all about being friendly hosts, being open about yourself and what you do, being willing to include others in an invitation to Church but also understanding not all may want to come and recognising when it's possible to be a bit flexible about going and when it's not. And isn't being a good guest about appreciating that your host might be involved in Churchbor another activity which you might not be, and understanding they might invite you along and that sometimes as a guest you go along to something you might not usually, but feeling you can say if you don't want to. And isn't it about recognising that a host might host you but also have some other commitments of any type which they have to meet - that means they have to go and meet them and you either join them or don't, but 24/7 attention as a guest isn't always possible, but not a sign your host isn't being a good host.
It doesn't seem that difficult. We all have regular commitments which we can probably miss very occasionally without it being a problem, but want to be involved as much as possible. Guests may well mean some change of plans or not necessarily.