Their wedding, they should've arranged for and paid for installing and removing a ramp if they wanted their wedding held at someone else's house. I feel for the bridesmaid as of course she wouldn't want to be excluded from the table where everyone else in the wedding party had been seated.

He could've also had the table on the ground instead of on a platform. Easier solution.

I see that the wedding was canceled.

If it was the original poster's wedding, then absolutely any guest should have accommodations made. And there is usually more than one solution (as above.) But it was someone else's wedding, so that was their responsibility to pay for, arrange, and remove a ramp later.